This is the 4746th most frequent German word.
zehnten
"Tenth" (ordinal number) or "tithe" (historically, one-tenth portion).
Here, 'zehnten' functions as an adjective describing which attempt (ordinal number).
Dieses ist mein zehnten Versuch.
This is my tenth attempt.
In this instance, 'zehnten' is describing the specific part (tenth) of something distributed.
Ich habe ihm den zehnten Teil gegeben.
I gave him the tenth part.
In this sentence, 'zehnten' is used as an ordinal number to specify the date (tenth day).