a person who is not on active duty with a military, naval, police, or fire fighting organization.

Informal . anyone regarded by members of a profession, interest group, society, etc., as not belonging; nonprofessional; outsider

We need a producer to run the movie studio, not some civilian from the business world.

a person versed in or studying Roman or civil law.

of, pertaining to, formed by, or administered by civilians.

adjective

military

adjective

noncombatant , noncombative , nonmilitant , not in armed forces , pacificist , private , unhostile

noun

citizen , civ , civvie , commoner , noncombatant , private citizen , subject , nonmilitant , pacificist , practitioner