Is GLslang a scalar language?

I am confused. Someone, some time ago said that glslang is a scalar language. Now I cant find it and dont know is it true?

And what is the definition of a vector language?

scratches head GLslang supports scalar and vector values. . .

C++ also supports vector values through STL valarrays. Does it make it a vector language?
And does exist definition of vector and scalar language. Me cant google it.

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