Latin, "situation, position" (see site). In technical uses in English, "proper or original position and location of something" (as in in situ).
situ
situate
situation
situational
sit-up
situs
sitz-bath
sitzkrieg
Siva
six
sixfold
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}