The location at which an alleged trespass has been committed, or where a distraint has been made. Now also more generally: the scene of an alleged offence or disputed event.
2The place in question; the (notional) location of something.
locus in quo/ˌləʊkəs ɪn ˈkwəʊ/ /ˌlɒkəs ɪn ˈkwəʊ/
Mid 17th century; earliest use found in Richard Brownlow (1553–1638), legal official. From classical Latin locus in quō the place in which from locus place + in + quō, ablative of quī which.