What is the meaning of Gender-neutral?

Not having, indicating, or being restricted on the basis of, gender.

Used by or intended for people of any gender; not restricted to (only one) gender; available to all genders.

Of words, phrasing, etc.: not indicating or referring to (only one) gender.

In particular, in languages where words are assigned to one grammatical gender or another: lacking such an assignment. (Can we add an example for this sense?)

Source: wiktionary.org