Transit

The word "transit", when used alone, has several possible meanings in English

means of transportation, including mass transit, rapid transit, public transit, public transport; see transit (transportation)
in astronomy an event involving two bodies along the same line of sight; see astronomical transit
in navigational position lines when a navigator observes two fixed reference points in line; see navigational transit
in surveying, a specialized instrument (more specifically, a specialized theodolite, and not to be confused with a transit instrument in astronomy, for which see below); see transit (surveying)

"Transit" is also a part of the name of:

transit papers or transit visa; see border control
transit instrument, a specialized astronomical telescope for observing transits
Transit program, a precursor to the GPS satellite navigation system

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