- A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation. (noun)
- Something taken to be true for the purpose of argument or investigation; an assumption. (noun)
- The antecedent of a conditional statement. (noun)
- A suggested explanation for a group of facts or phenomena, either accepted as a basis for further verification (working hypothesis) or accepted as likely to be true (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- An assumption used in an argument without its being endorsed; a supposition (noun)
- An unproved theory; a conjecture (noun)
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