What's the difference between bateless and dateless?

Bateless

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Definition:

• (a.) Not to be abated.

Example Sentences:

Dateless

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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.