This is the 6880th most frequent Russian word.
адвокатской
"Of or related to a lawyer or law office."
In this sentence, 'адвокатской' is the feminine singular form of the adjective 'адвокатский,' which means 'of a lawyer' or 'legal,' modifying 'конторе,' the dative singular form of 'office.'
Адвокатской конторе потребовалось больше сотрудников.
The law firm required more employees.
Here, 'адвокатской' is used again as a feminine singular adjective, now describing 'деятельностью,' the instrumental singular form of the noun 'activity' or 'work,' relating to the profession of a lawyer.
Её отец занимается адвокатской деятельностью.
Her father practices law.
In this example, 'адвокатской' modifies 'ассоциации,' the dative case singular form of 'association,' indicating a group related to lawyers.