This is the 11821st most frequent Russian word.
заместителю
"To the deputy" or "to the substitute."
In this sentence, 'заместителю' is in the dative case, indicating the indirect object of the gratitude ('to your deputy').
Спасибо вашему заместителю за помощь.
Thank your deputy for the help.
Here, 'заместителю' is in the dative case and signifies the recipient of the action ('to the deputy director').
Документ передали заместителю директора.
The document was handed to the deputy director.
In this case, 'заместителю' is in the dative case and indicates the individual assigned the responsibility ('to the deputy').