Pronunciation: ( ˌ )in- ' s ī -( ˌ )tü, - ' si-, -( ˌ )tyü also - ' s ē -, -( ˌ )chü
Function: adverb or adjective
Etymology: Latin, in position
Date: 1740
: in the natural or original position or place <an in situ cancer confined to the breast duct>