Meaning

• An expression of mirth particular to the human species; the sound heard in laughing; laughter.

  "His deep laughs boomed through the room."

• Something that provokes mirth or scorn.

  "Your new hat's an absolute laugh, dude."

• A fun person.

Meaning

• 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.

  "There were many laughing children running on the school grounds."

• To be or appear cheerful, pleasant, mirthful, lively, or brilliant; to sparkle; to sport.

• (followed by "at") To make an object of laughter or ridicule; to make fun of; to deride; to mock.

  "Don't laugh at my new hat, man!"

• To affect or influence by means of laughter or ridicule.

• To express by, or utter with, laughter.