What's the difference between dateless and mateless?

Dateless

Definition:

• (a.) Without date; having no fixed time.

Example Sentences:

• (1) In Audi’s “Prom” ad , a dateless teenager is inspired to steal a big kiss at the big dance after his dad loans him the new A6.

Mateless

Definition:

• (a.) Having no mate.

Example Sentences: