As others have said - aerodrome boundary means just that. Only used for heli's not fixed wing, as you're (as I'm guessing that's what you fly) are more flexible to handle than planks. If you hear that then don't expect to use the runway - you'll probably get sent straight from there to your landing / parking spot.
If we meant ATZ boundary - we'd say it, if we mean CTR boundary, we'd say that. Ambiguity isn't part of the job description.