long

/lɔŋ/ adj [-er/-est only] (TIME)

Definition

› being an amount of time that is more than average or usual, or being of a particular amount of time: The days are longer in summer than in winter. We had to wait a long time to see the doctor. We went away for a long weekend in April (= Saturday, Sunday, and an extra day or days). › Something that is long-lost has not been seen for many years before appearing suddenly: A long-lost diary was discovered among his papers.

(Definition of long adj (TIME) from the Cambridge Academic Content Dictionary © Cambridge University Press)