(Britain, Australia, New Zealand) A worker who is only working for a company occasionally, not as its permanent employee.

A soldier temporarily at a place of duty, usually en route to another place of duty.

(UK, historical) A member of a group of football hooligans who wear expensive designer clothing to avoid police attention; see casual (subculture).

One who receives relief for a night in a parish to which he does not belong; a vagrant.

(video games, informal, derogatory) A player of casual games.

(fandom slang) A person whose engagement with media is relaxed or superficial.

(Britain, dated) A tramp.

(in the plural) Shoes suitable for everyday use, as opposed to more formal footwear.

Happening by chance.

Coming without regularity; occasional or incidental.

Employed irregularly.

Careless.

Happening or coming to pass without design.

(of behavior, usage, or milieu) Informal; relaxed.

(of clothing or utensils) Designed for informal or everyday use.