A Quick and Simple Dictionary

laugh

1. Noun.  An expression of mirth particular to the human species; the sound heard in laughing; laughter.
2. Noun.  Something that provokes mirth or scorn.
3. Noun.  (rfd-sense) (UK) A fun person.
4. Verb.  (intransitive) To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.
5. Verb.  (intransitive, obsolete) To be or appear cheerful, pleasant, mirthful, lively, or brilliant; to sparkle; to sport.
6. Verb.  (intransitive, followed by "at") To make an object of laughter or ridicule; to make fun of; to deride; to mock.
7. Verb.  (transitive) To affect or influence by means of laughter or ridicule.
8. Verb.  (transitive) To express by, or utter with, laughter.