English obligatory

← Middle English obligatorie (inherited)

← Proto-Indo-European *leyǵ- (root)

← Latin obligatōrius (derived)

→ English obligatorily (suffix)

→ English nonobligatory (prefix)

→ English obligatoriness (suffix)

→ English disobligatory (prefix)

→ English obligatorification (affix)

→ English obligatorize (affix)

→ English obligala (blend)