—n. 1. the act or fact of passing across or through; passage from one place to another.
2. conveyance or transportation from one place to another, as of persons or goods, esp., local public transportation: city transit. Cf. mass transit. 3. a transition or change.
4. Astron. a. the passage of a heavenly body across the meridian of a given location or through the field of a telescope.
b. the passage of Mercury or Venus across the disk of the sun, or of a satellite or its shadow across the face of its primary.
c. See meridian circle. 5. Astrol.the passage of a planet in aspect to another planet or a specific point in a horoscope.
6. Survey. a. Also called transit instrument. an instrument, as a theodolite, having a telescope that can be transited, used for measuring horizontal and sometimes vertical angles.
b. a repeating transit theodolite.
7. (cap.) U.S. Aerospace.one of a series of satellites for providing positional data to ships and aircraft.
—v.t. 1. to pass across or through.
2. Survey.to turn (the telescope of a transit) in a vertical plane in order to reverse direction; plunge.
3. Astron.to cross (a meridian, celestial body, etc.).
—v.i. 1. to pass over or through something; make a transit.
2. Astron.to make a transit across a meridian, celestial body, etc.