n.
Pronunciation: ' in
Function: adjective
Date: 1599
1 a : that is located inside or within <the in part> b : that is in position, operation, or power <the in party> c : INSIDE 2
2 : that is directed or bound inward : INCOMING <the in train>
3 a : extremely fashionable <the in thing to do> b : keenly aware of and responsive to what is new and fashionable <the in crowd>