Wiktionary
semi-auto
a. (context informal English) (alternative form of semi-automatic English)
Usage examples of "semi-auto".
In fact, aside from the fact that it was made out of old-fashioned steel and had no provision for conversion to semi-auto mode, it was effectively identical to the bolt of Roger's own rifle, complete to the small electronic contact on the bolt face, and he laughed.
Until we can go to smokeless powder and a semi-auto, this is our best bet, I think.