What is the meaning of Quo?

quoth

Paired with quid, in reference to the phrase quid pro quo (“this for that”): something given in exchange for something else.

which

what

whither, whereto, where

(relative / interrogative) To or in which place, whither, where

To what end, for what purpose, wherefore, why

To the end that, in order that, so that, that

ablative masculine/neuter singular of quī

ablative masculine/neuter singular of quī

ablative masculine/feminine/neuter singular of quis

alternative form of who (“who”, nominative)

alternative form of co

Source: wiktionary.org