conventional (adj.)

late 15c., "of the nature of an agreement," from Late Latin conventionalis "pertaining to convention or agreement," from Latin conventionem (nominative conventio) "a meeting, assembly; agreement," noun of action from past-participle stem of convenire "unite, be suitable, agree, assemble," from assimilated form of com "with, together" (see con-) + venire "to come" (from PIE root *gwa- "to go, come").

Meaning "of the nature of a formal meeting of delegates" is from 1812, now rare; that of "established by social convention, arising out of custom or usage" is from 1761; sense of "following tradition" is from 1831. Of weapons, "non-nuclear," from 1955. Related: Conventionally.

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Definitions of conventional

conventional (adj.)
following accepted customs and proprieties;
she had strayed from the path of conventional behavior
conventional wisdom
conventional forms of address
conventional (adj.)
conforming with accepted standards;
a conventional view of the world
Synonyms: established
conventional (adj.)
(weapons) using energy for propulsion or destruction that is not nuclear energy;
conventional weapons
conventional warfare
conventional (adj.)
unimaginative and conformist;
conventional bourgeois lives
conventional attitudes
conventional (adj.)
represented in simplified or symbolic form;
Synonyms: formal / schematic
conventional (adj.)
in accord with or being a tradition or practice accepted from the past;
a conventional church wedding with the bride in traditional white
the conventional handshake
conventional (adj.)
rigidly formal or bound by convention;
Synonyms: ceremonious