In philosophy and logic, contingency is the status of propositions that are not necessarily true or necessarily false. Here are four classes of propositions, some of which overlap:
Usually, necessary proposition is understood to mean necessarily true proposition.

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Quotations
Arwin: (after seeing Hannah Montanna) You're Hannah Montana! Oh, I almost passed out. (freezes and falls to the ground sideways)
Arwin: It's Carey's birthday present. Don't tell her. Moseby: I wouldn't be able too if I tried.
Carey: Life is full of risks but you can't spend your whole life hiding. Cody: Easy for you to say. Most of your life is over.
Cody: You're Hannah Montana!Hannah: And you're wearing cake. (takes a bit from Zack's shirt) Mmm, vanilla, my favorite.
Jackson: You guys, you gotta check this out! (Holds up videotape) It's labeled Robbiepalooza. Miley: Oh! Dad had his own Palooza.
Lily: Before your Dad was a Dad he was cool. Before my Dad was a Dad he was an accountant.

Encyclopedia
In philosophy and logic, contingency is the status of propositions that are not necessarily true or necessarily false. Here are four classes of propositions, some of which overlap:
- necessarily true propositions, which must be true, no matter what the circumstances are or could be (examples: 2 + 2 = 4; All bachelors are unmarried).
- necessarily false propositions, which must be false, no matter what the circumstances are or could be (examples: 2 + 2 = 5; Anne is both taller than and shorter than Brad).
- contingent propositions, which are not necessarily true and not necessarily false (examples: There are only three planets; There are more than three planets).
- possible propositions, which are true or could have been true given certain circumstances (examples: 2 + 2 = 4; There are only three planets; There are more than three planets). All necessarily true propositions, and all contingent propositions, are also possible propositions.
Usually, necessary proposition is understood to mean necessarily true proposition.
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