IPA: /ˈkæʒuəl/
KK: /ˈkæʒuəl/
Relaxed and informal; not requiring special or formal dress or behavior.
She wore a casual dress to the picnic.
A person who works temporarily or occasionally, often in a job that does not require a long-term commitment.
The company hired several casuals to help during the busy season.
Casual is derived from the Latin word "casualis" (meaning happening by chance) and the root "casus" (meaning fall or chance). The word "casual" refers to something that occurs by chance or is informal and relaxed in nature.
Think of something that happens 'by chance' — that's why 'casual' describes a relaxed or informal situation.