From Middle English able, from Old Northern French able, variant of Old French abile, habile, from Latin habilis, from habeō + -ibilis.
From Middle English ablen, from Middle English able (adjective).
From the first letter of the word. Suggested in the 1916 United States Army Signal Book to distinguish the letter when communicating via telephone, and later adopted in other radio and telephone signal standards.
Modern English dictionary
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