"affectionate, devoted, fond," 1793, past-participle adjective from attach in the sense "join to or with in companionship or affection" (1765). Earlier the adjective meant "arrested" (1610s). The literal sense of "fastened on" is from 1841.
all art schools whether independent or attached to universities
a block of attached houses
she was very attached to her father
Atropos
attaboy
attach
attachable
attache
attached
attachment
attack
attain
attainable
attainder