No, it's not. "assault weapon" is a made up term that means nothing outside the specific law that's using it. Every definition of "assault weapon" I've seen includes "semi-auto" To be an "assault weapon" it has to be made after Sept. 13th, 1994. Same gun made a day earlier can never be an "assault weapon". And a rifle that's an "assault weapon" in Mass. ceases to be one when moved to NH, because Mass. law has no authority in NH.
What you're thinking of is "assault rifle", which is a real thing with a real definition. "assault rifles" are not explicitly banned or regulated, they're regulated under "machine guns" or sometimes also "short barreled rifles"