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From The Collaborative International Dictionary of English v.0.48:
Gratuitous \Gra*tu"i*tous\a. [L. gratuitus, from gratus pleasing. See Grate, a., Gratis.] 1. Given without an equivalent or recompense; conferred without valuable consideration; granted without pay, or without claim or merit; not required by justice. [1913 Webster] We mistake the gratuitous blessings of Heaven for the fruits of our own industry. --L'Estrange. [1913 Webster] 2. Not called for by the circumstances; without reason, cause, or proof; adopted or asserted without any good ground; as, a gratuitous assumption. [1913 Webster] Acts of gratuitous self-humiliation. --De Quincye. -- Gra*tu"i*tous*ly, adv. -- Gra*tu"i*tous*ness, n. [1913 Webster]