This is the 925th most frequent Azerbaijani word.
ordusuna
"Ordusuna" means "to his/her/its army" in English.
The word 'ordusuna' in this sentence is used in the dative case with the meaning 'to the army'.
O, məmləkətin ordusuna qoşulmağa qərar verdi.
He decided to join the country's army.
Here 'ordusuna' refers to 'for the army', indicating the beneficiary of the purchasing action.
Ordusuna yeni silahlar alındı.
New weapons were purchased for the army.
In this sentence, 'ordusuna' suggests possession, meaning 'for his army' as an object of emotional connection.