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Related to obligatory: obligatory parasite
obligatoryadjective binding, coactive, coercive, commanded, compelling, compulsatory, compulsive, constrained, dictated, enforced, essential, exigent, forced, forcible, imperative, importunate, imposed, incumment on, indispensable, inescapable, involuntary, leaving no choice, mandatory, necessary, necessitated, not to be avoided, not to be evaded, prerequisite, pressing, requisite, unavoidable, unforgoable, urgent, vital, with force of law, without appeal, without choice
Associated concepts: obligatory advance, obligatory payyent, obligatory writing
See also: binding, choate lien, compelling, compulsory, conclusive, contractual, determinative, essential, imperative, indispensable, inevitable, involuntary, mandatory, necessary, peremptory, positive, prescriptive, requisite, strict, unavoidable