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Merriam Webster, ``feminism, n.: the theory of the political, economic, and social equality of the sexes''. Now we need to prove that that is logically equivalent to gender-blindness.
"feminism" => "gender-blindness": Since gender is a social construct that happens to be correlated with one's sex, and equality cannot be achieved if people are treated differently (by society) based on their sex and gender, society needs to ignore sex (and gender) when interacting with an individual. The latter statement is the definition of gender-blindness, so we proved this part.
"gender-blindness" => "feminism": If society disregards sex and gender when interacting with an individual, then necessarily it is treating sexes equally, which is, by the Merriam-Webster definition, feminism. ■