moon·light / ˈmoōnˌlīt/ • n. the light of the moon: I wanted you to see the courtyard by moonlight.• adj. illuminated or happening by the light of the moon: a moonlight stroll.• v. (past and past part. -light·ed) [intr.] inf. have a second job in addition to one's regular employment: many instructors moonlight as professional consultants.DERIVATIVES: moon·light·er n.