Short form of context — what is woven alongside a thing and gives it meaning. A named abbreviation.
Latin contextus (a joining, connection), from contexere (to weave together), from com- (together) + texere (to weave), clipped in code to ctx; the surrounding weave a thing is understood within, shortened to fit a variable name.
Short form of context — what is woven alongside a thing and gives it its meaning. The abbreviation is a convenience; the weave it stands for is not.