ar ‧ ti ‧ cled /ˈɑːtɪk ə ld $ ˈɑːr-/ BrE AmE adjective British English
someone who is articled to a company of lawyers, ↑ accountant s etc, is employed by that company while they are training to become a lawyer etc:
an articled clerk
articled to
He was articled to a firm of architects.