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Definition of Mateless
1. Adjective. Not mated sexually. 
Similar to: Unmated
2. Adjective. Of someone who has no marriage partner.
Definition of Mateless
1. a. Having no mate.
Definition of Mateless
1. having no mate [adj]
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1. Adjective. Not mated sexually. 
1. a. Having no mate.
1. having no mate [adj]