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1. The aspect of meaning that a speaker conveys, implies, or suggests without directly expressing. Although the utterance "Can you pass the salt?" is literally a request for information about one's ability to pass salt, the understood implicature is a request for salt.
2. The process by which such a meaning is conveyed, implied, or suggested. In saying "Some dogs are mammals," the speaker conveys by implicature that not all dogs are mammals.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Logic) a proposition inferred from the circumstances of utterances of another proposition rather than from its literal meaning, as when an academic referee writes the candidate's handwriting is excellent to convey that he has nothing relevant to commend
2. (Logic) the relation between the uttered and the inferred statement
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014