n.
Function: adjective
Etymology: Middle English bounden, from past participle of binden to bind
Date: 14th century
1 : placed under legal or moral restraint or obligation : OBLIGED <duty- bound >
2 a : fastened by or as if by a band : CONFINED <desk- bound > b : very likely : SURE < bound to rain soon>
3 : made costive : CONSTIPATED
4 of a book : secured to the covers by cords, tapes, or glue
5 : DETERMINED , RESOLVED
6 : held in chemical or physical combination
7 : always occurring in combination with another linguistic form < un- in unknown and -er in speaker are bound forms> ― compare FREE 11d