Authors:

[Coining the phrase "test of significance"] Critical tests of this kind may be called tests of significance, and when such tests are available we may discover whether a second sample is or is not significantly different from the first.

"Statistical Methods for Research Workers". Book by Ronald Fisher, 1925.
[Coining the phrase test of significance] Critical tests of this kind may be called tests of significance, and when such tests are available we may discover whether a second sample is or is not significantly different