What is the meaning of -eth?

Used to form the third-person singular present indicative of verbs.

Used broadly with various verb forms for ironic pseudoarchaic or pseudoecclesiastical effect.

used to create ordinal numbers from cardinal numbers ending in -y, namely the multiples of ten (other than ten itself): 20, 30, 40, 50, 60, 70, 80, and 90; e.g. twentieth, thirtieth.

Used to form the third-person singular present indicative of verbs.

Alternative form of -the (abstract nominal suffix)

Alternative form of -the (ordinal suffix)

Source: wiktionary.org