in in WordNet English dictionary

1. a unit of length equal to one twelfth of a foot
   inch  in 
   

1. to or toward the inside of
   "come in"; "smash in the door"
   in  inwards  inward  in  inwards  inward 
   

1. currently fashionable
   "the in thing to do"; "large shoulder pads are in"
   in 
   
2. directed or bound inward
   "took the in bus"; "the in basket"
   in 
   
3. holding office
   "the in party"
   in