I managed to find, like I always do, a nice little definition from the European Parliament which was published in 2018. It says this: "Gender-neutral language is a generic term, covering the use of non-sexist language, inclusive language, or gender-fair language.", and the purpose of this gender-neutral language is "to avoid word choices which may be interpreted as biased, discriminatory or demeaning by implying that one sex or social gender is the norm. Using gender-fair and inclusive language … helps [to] reduce gender stereotyping, promotes social change and contributes to achieving gender equality." 