Let's go with the US for specitivity, but any country will do. I saw a quote from 1943 where a general talked about a computer as if everyone should know what it is. When would the average American have known what "computer" meant? What would they have associated it with?
This is slightly complicated as 'computer' hasn't always meant a mechanical one. For example, in the sci-fi Lensman series book Galactic Patrol, which was first serialised in 1937, a 'computer' is a man with a slide rule doing calculations.