/ˌin ˈsīto͞o/ /ˈsē-/
Adjective
1. In its original position or place. (wiktionary.org)
2. In the natural or normal place, confined to the site of origin without invasion of neighboring tissues. In the original or natural place or site; carcinoma in situ.(biology-online.org)
3. Being in the original position; not having been moved. (biology-online.org)
Adverb
1. In the original or natural place or site. (wordnetweb.princeton.edu)
Word origin: Latin, literally “in its (original) place or position”