Meaning

noun any person in the armed services who holds a position of authority or command

noun someone who is appointed or elected to an office and who holds a position of trust

noun a member of a police force

originFrom Middle English officer, from Anglo-Norman officer, officier, from Old French officer, Late Latin officiarius (“official”), from Latin officium (“office”) + -ārius (“-er”). By surface analysis, office + -er.

Etymology from Wiktionary, CC BY-SA 3.0