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Definition of Pray in aid
1. Verb. (intransitive now rare) To resort to the help (of); to call on the support (of), especially to help prove an argument. ¹
2. Verb. (transitive chiefly legal) To ask for the help of (someone or something) in pleading a case; to make use of, adduce (something) in defence of a case, argument etc. ¹
¹ Source: wiktionary.com