This is the 9563rd most frequent Turkish word.
almadığını
"Almadığını" means "that you did not take" or "that he/she/it did not take."
In this sentence, 'almadığını' (from 'almak') acts as a relative pronoun, reflecting a reported speech about the inability to 'get' or 'understand' something.
Kitaptan bir şey anlamadığını söyledi.
He/She said that he/she didn’t understand anything from the book.
Here, 'gelmediğini' (stem 'gelmek') combines with a negation to express acknowledgment of someone's absence.
Onun gelmediğini anladık.
We understood that he/she hadn't come.
This illustrates 'almadığını' in the context of the verb 'almak,' specifically indicating the action of receiving or taking something that did not happen.