biconditional

[bahy-kuhn-dish-uh-nl]

adjective Logic.

(of a proposition) asserting that the existence or occurrence of one thing or event depends on, and is dependent on, the existence or occurrence of another, as “A if and only if B.”

Origin:
1935–40; bi-¹ + conditional

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Biconditional is an LSAT word you need to know.

So is inflation. Does it mean:

process of body with electric or magnetic properties producing the same in other without contact

persistent substantial rise in the level of prices related to an increase in the volume of money

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Collins

World English Dictionary

biconditional (ˌbaɪkənˈdɪʃən^əl)

—n
	another name for equivalence

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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biconditional

bi·con·di·tion·al