Can Multiply be used as noun, such as in "matrix multiply"? I heard of this from some Americans.
Or should it be "matrix multiplication" instead?
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Agree with FumbleFingers. The experts from any domain have their own language and way of convincing the message. I'm a healthcare provider and while describing/discussing medical things among us, we generally overlook grammar because for us, that's trivial in that case.
I searched several dictionaries but could not find the word multiply as a noun. In my pro version of WordWeb (cannot give link here as it's not online) it says...
Multiply as a verb and adjective. Derived: Noun: multiple, multiplication, multiplier.
I further tried to understand the term in mathematics as well. As you got it right, the correct term is Matrix Multiplication. So, maybe, the experts use it in an informal way but the message is convinced.