Learn English – Word or phrase that describes something that was very modern at some time in the past

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I am looking for a word or phrase that describes something that was very modern in the time being referenced, even though it is clearly not modern now. For example, I am writing about a computer language from the 1970's.

Best Answer

pioneering (adjective)

Involving new ideas or methods:

Company X used FORTRAN, a pioneering programming language [of the 70's].

'Pioneering' provides, or implies, the context of historical foundation and excitement of the evolving technology of programming languages, FORTRAN in particular, during the 1970's.