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.
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.
[im-pli-kuh-cher] 
plɪ