n. 1 the constraining power of a law, precept, duty, contract, etc. 2 a duty; a burdensome task. 3 a binding agreement, esp. one enforceable under legal penalty; a written contract or bond. 4 a a service or benefit (repay an obligation). b indebtedness for this (be under an obligation). day of obligation Eccl. a day on which all are required to attend Mass or Communion. of obligation obligatory. obligational adj.
[ ME f. OF f. L obligatio -onis (as OBLIGE) ]