( chiefly Brit. also ~st )
■ preposition
1》 surrounded by; in the middle of.
2》 being a member or members of (a larger set).
3》 occurring in or practised by (some members of a group).
4》 indicating a division, choice, or differentiation involving three or more participants.
Origin
OE ongemang (from on 'in' + gemang 'assemblage, mingling').