What is the meaning of Casual?

Happening by chance.

Coming without regularity; occasional or incidental.

Employed irregularly.

Careless.

Happening or coming to pass without design.

Informal; relaxed.

Designed for informal or everyday use.

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.

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.

A player of casual games.

A person whose engagement with media is relaxed or superficial.

A tramp.

Shoes suitable for everyday use, as opposed to more formal footwear.

casual

unplanned

casual (happening by chance)

casual (coming without regularity)

casual (designed for informal or everyday use)

casual

accidental

coincidental, chance

Source: wiktionary.org