Webster's English Dictionary

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transit

1. tran.sit \'tran(t)s-*t, 'tranz-\ n [L transitus, fr. transitus, pp. of 
   transire to go across, pa]ss 1a: an act, process, or instance of passing 
   through or over : PASSAGE)M 1b: CHANGE, TRANSITION  1c1: conveyance of 
   persons or things from one place to another  1c2: usu. local transportation 
   esp. of people by public conveyance; also  : vehicles or a system engaged 
   in such transportation 2a: passage of a celestial body over the meridian of 
   a place or through the  field of a telescope 2b: passage of a smaller body 
   (as Venus) across the disk of a larger (as th e sun) 3: a theodolite with 
   the telescope mounted so that it can be transited 
2. transit vi : to make a transit  1a: to pass over or through  1b: to 
   cause to pass over or through  2: to pass across  3: to turn (a telescope) 
   over about the horizontal transverse axis in surv eying