CPER: explanation of abbreviations, prefixes (English, Greek, Latin) and acronyms concerning overall site.
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a.k.a. = also known as ...
A.k.a. is used to introduce synonyms, pseudonyms, aliases, nicknames, working names, legalized names, pen names, maiden names, etc. (Compare f.k.a. for "formerly known as".)
Ad = "At", "Regarding", "With regard to".