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is Latin for "from the former" or "from before", and may refer to:
- A priori knowledge, justification or arguments. See a priori and a posteriori.
- A priori (languages)
An a priori language is any constructed language whose vocabulary is not based on existing languages, unlike a posteriori constructed languages. Examples of a priori languages include Ro, Solresol, Mirad, Klingon, and Na'vi...
, a type of constructed language
- A priori (statistics)
In statistics, a priori knowledge is prior knowledge about a population, rather than that estimated by recent observation. It is common in Bayesian inference to make inferences conditional upon this knowledge, and the integration of a priori knowledge is the central difference between the Bayesian...
, a knowledge of the actual population
- Apriori algorithm
In computer science and data mining, Apriori is a classic algorithm for learning association rules. Apriori is designed to operate on databases containing transactions...
, a classic algorithm for learning association rules
- A priori estimate
In the theory of partial differential equations, an a priori estimate is an estimate for the size of a solution or its derivatives of a partial differential equation. A priori is Latin for "from before" and refers to the fact that the estimate for the solution is derived before the solution is...
of a solutions of a differential equation
A priory is a house of men or women under religious vows that is headed by a prior or prioress. Priories may be houses of mendicant friars or religious sisters , or monasteries of monks or nuns .The Benedictines and their offshoots , the Premonstratensians, and the...
, a house of men or women under religious vows headed by a prior or prioress
- A'priori, a rock/metal/prog band from Blackpool, Lancashire, UK