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Ido and Interlingua compared

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Both languages are fairly successful, but Interlingua

Interlingua

Interlingua is an international auxiliary language , developed between 1937 and 1951 by the International Auxiliary Language Association...

has enjoyed greater diffusion and acceptance by public and private institutions. Interlingua is taught in many high schools and universities, for example. Ido

Ido

Ido is a constructed language created with the goal of becoming a universal second language for speakers of different linguistic backgrounds as a language easier to learn than ethnic languages...

is what is called schematic (easier to learn for speakers of very different languages), whereas Interlingua is what is called naturalistic (easier to understand for speakers of related languages).

Neutrality of vocabulary

While both languages have a majority of Latin/Romance words in their lexicons, Ido has a somewhat larger number of Germanic and Slavic words, so it could be suggested that Ido is more internationally neutral. Germanic and Slavic words in Interlingua are often Romanized. Compare English blockade, German Blockade, and Interlingua blocada. When Interlingua adopts foreign words, however, they frequently retain their original form. By comparison, almost all words in Ido take on characteristic Ido finals and orthographies. (Ido proper names have a greater degree of flexibility than other Ido words.)

Both languages make use of an objective procedure to identify international words for their lexicons. Interlingua’s procedure identifies a prototype that is common to the various forms of a word in its source languages, and its control languages are selected to increase the internationality of its vocabulary. Since their vocabularies are very similar, it is likely that both languages possess an internationality that extends beyond the Western language families.

Wordforms can enter the vocabulary of Interlingua by derivation from a small number of roots and affixes. Speakers who are familiar with these roots and affixes can understand words developed from them, a feature that facilitates learning for speakers of any language background.

Orthography

Both languages use the Latin alphabet, but Ido orthography is such that based on the spelling of a word, you can pronounce it unambiguously. This is largely true of Interlingua as well.

Ido	IPA International Phonetic Alphabet The International Phonetic Alphabet "The acronym 'IPA' strictly refers [...] to the 'International Phonetic Association'. But it is now such a common practice to use the acronym also to refer to the alphabet itself that resistance seems pedantic...	Interlingua
A, a	a	A, a
B, b	b Voiced bilabial plosive The voiced bilabial plosive is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is b. The voiced bilabial plosive occurs in English, and it is the sound denoted by the...	B, b
C, c	ts Voiceless alveolar affricate The voiceless alveolar affricate is a type of consonantal sound, used in some spoken languages. The sound is transcribed in the International Phonetic Alphabet with ⟨⟩ or ⟨⟩ . The voiceless alveolar affricate occurs in such languages as German, Cantonese, Italian, Russian, Japanese and Mandarin...	C,c before e, i, or y
Ch, ch	tʃ Voiceless postalveolar affricate The voiceless palato-alveolar affricate or domed postalveolar affricate is a type of consonantal sound used in some spoken languages. The sound is transcribed in the International Phonetic Alphabet with ⟨⟩ or ⟨⟩...	Ch, ch
D, d	d Voiced alveolar plosive The voiced alveolar plosive is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents voiced dental, alveolar, and postalveolar plosives is , and the equivalent X-SAMPA symbol is d.-Features:Features of the voiced...	D, d
E, e	e Close-mid front unrounded vowel The close-mid front unrounded vowel, or high-mid front unrounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is .... or ɛ	E, e
F, f	f Voiceless labiodental fricative The voiceless labiodental fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is .-Features:Features of the voiceless labiodental fricative:...	F, f; Ph, ph
G, g	g Voiced velar plosive The voiced velar plosive is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is g. Strictly, the IPA symbol is the so-called "opentail G" , though the "looptail G" is...	G, g
H, h	h Voiceless glottal fricative The voiceless glottal transition, commonly called a "fricative", is a type of sound used in some spoken languages which patterns like a fricative or approximant consonant phonologically, but often lacks the usual phonetic characteristics of a consonant...	H, h
I, i	i Close front unrounded vowel The close front unrounded vowel, or high front unrounded vowel, is a type of vowel sound, used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ....	I, i
J, j	ʒ Voiced postalveolar fricative The voiced palato-alveolar fricative or voiced domed postalveolar fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is Z. An alternative symbol used in some...	J, j
K, k	k Voiceless velar plosive The voiceless velar stop or voiceless velar plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is k....	C,c; Ch,ch Q,q; K,k (Q,q almost always appears before U,u)
L, l	l Alveolar lateral approximant The alveolar lateral approximant, also known as clear l, is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar lateral approximants is , and the equivalent X-SAMPA symbol is l.As a...	L, l
M, m	m Bilabial nasal The bilabial nasal is a type of consonantal sound used in almost all spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is m...	M, m
N, n	n Alveolar nasal The alveolar nasal is a type of consonantal sound used in numerous spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar nasals is , and the equivalent X-SAMPA symbol is n....	N, n
O, o	o or ɒ Open back rounded vowel The open back rounded vowel, or low back rounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is . The symbol is called turned script a, because it is a rotated version of script a, so-called because it...	O, o
P, p	p Voiceless bilabial plosive The voiceless bilabial plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is p...	P, p
Qu,qu	k Voiceless velar plosive The voiceless velar stop or voiceless velar plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is k.... w or k Voiceless velar plosive The voiceless velar stop or voiceless velar plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is k.... v Voiced labiodental fricative The voiced labiodental fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is v....	Qu, qu
R, r	r Alveolar trill The alveolar trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar trills is , and the equivalent X-SAMPA symbol is r. It is commonly called the rolled R, rolling R, or trilled R...	R, r
S, s	s Voiceless alveolar fricative The voiceless alveolar sibilant is a common consonant sound in spoken languages. It is the sound in English words such as sea and pass, and is represented in the International Phonetic Alphabet as . It has a characteristic high-pitched, highly perceptible hissing sound...	S, s; optionally C, c before i, e, y
Sh, sh	ʃ Voiceless postalveolar fricative The voiceless palato-alveolar fricative or voiceless domed postalveolar fricative is a type of consonantal sound, used in many spoken languages, including English...	Ch, ch; Sh, sh (Sh, sh is rare)
T, t	t Voiceless alveolar plosive The voiceless alveolar plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents voiceless dental, alveolar, and postalveolar plosives is , and the equivalent X-SAMPA symbol is t...	T, t; Th, th
U, u	u Close back rounded vowel The close back rounded vowel, or high back rounded vowel, is a type of vowel sound, used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is u....	U, u
V, v	v Voiced labiodental fricative The voiced labiodental fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is v....	V, v
W, w; U, u (before a vowel)	w	U, u; W, w (W, w is rare)
X,x	k Voiceless velar plosive The voiceless velar stop or voiceless velar plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is k.... s Voiceless alveolar fricative The voiceless alveolar sibilant is a common consonant sound in spoken languages. It is the sound in English words such as sea and pass, and is represented in the International Phonetic Alphabet as . It has a characteristic high-pitched, highly perceptible hissing sound... or g Voiced velar plosive The voiced velar plosive is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is g. Strictly, the IPA symbol is the so-called "opentail G" , though the "looptail G" is... z Voiced alveolar fricative The voiced alveolar fricatives are consonantal sounds. The symbol in the International Phonetic Alphabet that represents these sounds depends on whether a sibilant or non-sibilant fricative is being described....	X, x
Y, y; I, i (before a vowel)	j Palatal approximant The palatal approximant is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is '...	I,i; Y, y
Z, z	z Voiced alveolar fricative The voiced alveolar fricatives are consonantal sounds. The symbol in the International Phonetic Alphabet that represents these sounds depends on whether a sibilant or non-sibilant fricative is being described....	Z, z; S, s

Ido and Interlingua compared

Neutrality of vocabulary

Orthography

See also