The Latin root *lig* and its variants *li* and *ly* mean "tie." This Latin root is the word origin of a good number of English vocabulary words, including [*lig*]ament, re[*li*]able and re[*ly*]. The root *lig* is easily recalled via the word ob[*lig*]ation, for an ob[*lig*]ation "ties" you to the doing of something.