How does “where”, “whither” come to mean “as”?
Maybe in the sense “in the way”?
What is the context? What is the sense and function of as here?
A little more detail would go a long way into clarifying such queries.
But I’m not asking about a specific usage, I am asking about the relation between the two normal senses of this form, the one being where, the other as.
It’s the dative feminine singular form of the relative pronoun ὅς. It’s used as a general relative adverb that can be translated “where”, “as” or other English adverbial expressions depending on the context.