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I’m reviewing a New Zealand scientific report which uses the word ‘equivalency’. This sounds to me like an Americanisation of the word ‘equivalence’, both being nouns but with the redundancy of an additional syllable in ‘equivalency’.

As we use British English (despite word processing software trying to force American English upon us) I’m inclined to use ‘equivalence’.  What do you think?

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I think 'equivalency' is mostly used in America. Even the ngram view of 'equivalence' and 'equivalency' makes it clear that the use of the former is widely prevalent. There is no specific reason to add 'equivalency' to the existing 'equivalence'.

K. Satyanarayana Rao July 21, 2017, 11:20am

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Even in American books, equivalence is far more common.

jayles July 21, 2017, 1:27pm

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