noun

• (British, New Zealand) A fun person.
  "a good laugh"

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.
  "There were many laughing children running on the school grounds."
• (intransitive, figuratively, obsolete) To be or appear cheerful, pleasant, mirthful, lively, or brilliant; to sparkle; to sport.
  "The green ſtem grows in ſtature and in ſize, / But only feeds with hope the farmer's eyes; / Then laughs the childiſh year with flow'rets crowned, / And laviſhly prefumes the fields around, / But no ſubſtantial nouriſhment receives, / Infirm the ſtalks, unſolid are the leaves."
• (intransitive, 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!"
• (transitive) To affect or influence by means of laughter or ridicule.
  "Will you laugh me aſleepe, for I am very heauy."