Dictionary Search Results Search for: Leave blank to see all terms (creates a very large page; please be patient). Options: Search only within terms. Exact matches only. Highlight hits in red. For a selection of basic naval terms, see the log and report glossary. Results: a5l A5Labbreviation: USNR officer designation. Limited General Service, Lighter than Air Pilot. Formerly (A5)L and A-VT.