mid-15c., from Latin transitus, past participle of transire "go or cross over" (see transient). Astronomical sense is from 1680s. Related: Transited; transiting.[transit etymology, transit origin, 英语词源]
mid-15c., "act or fact of passing across or through," from Latin transitus "a going over, passing over, passage," verbal noun from past participle of transire "go or cross over" (see transient). Meaning "a transit of a planet across the sun" is from 1660s. Meaning "public transportation" is attested from 1873.