In English and some other languages (such as Portuguese and possibly Italian), the word "calculus" is actually an abbreviation from "differential and integral calculus" that has taken the meaning of the whole expression.
Part of my question is whether the word is still used alone in the language with its former meaning of computation, or can it only appear with a qualifier specifying what kind of computation it can be, for example "tensor calculus", "construction calculus" or "lambda-calculus".
I did not find any example of the use of calculus alone in English with its original meaning, except for one case I was given as example: "it does not enter my calculus". However my feeling is that "someone's calculus", i.e. calculus with a possessive or a genitive is a kind of frozen expression meaning "someone's plans", and hence does not qualify. Would you agree?
I would appreciate comments on this, and possibly technical names for the phenomenon. I am not a native speaker of any of the languages mentioned here (and for some, not a speaker at all).
This derives from a question on SE: https://cs.stackexchange.com/questions/22126