I. -eth /əθ, ɪθ/ (also -th) suffix old use or biblical
[Language: Old English; Origin: -eth, -ath]
forms the third person singular of verbs:
he giveth

[TahlilGaran] Dictionary of Contemporary English ▲

II. -th /θ/ suffix
[Sense 1: Language: Old English; Origin: -tha]
[Sense 2: Language: Old English; Origin: -eth, -ath, -th]

1. forms ORDINAL numbers, except with 1, 2, or 3:
the 17th of June
a fifth of the total ⇒ -nd, -rd, -st

2. old use or biblical another form of -eth
he doth (=does)

[TahlilGaran] Dictionary of Contemporary English ▲

-th :
-th
suffix
BAD: It was their 23th wedding anniversary.
GOOD: It was their 23rd wedding anniversary.

Usage Note:
Use -th when the word for the number ends with '-th': '6th May' (= sixth ), '18th May' (= eighteenth ). Do not use -th with (numbers ending) 1, 2, 3.
Compare: '1st May' (first ), '2nd May ' (second ), '3rd May ' (third )

[TahlilGaran] Dictionary of Common Errors ▲

TH
Thursday

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲