civil >> /ˈsɪv(ə)l/
Definition: [adjective] Relating to ordinary citizens and their concerns, as distinct from military or ecclesiastical matters.
Example: civil aviation
Definition: [adjective] Courteous and polite.
Example: we tried to be civil to him
Definition: [adjective] (of time measurement or a point in time) fixed by custom or law rather than being natural or astronomical.
Example: civil twilight starts at sunset