The Collaborative International Dictionary
Unanimousness
Unanimous \U*nan"i*mous\, a. [L. unanimus, unanimus; unus one + animus mind: cf. F. unanime. See Unit, and Animate.]
Being of one mind; agreeing in opinion, design, or determination; consentient; not discordant or dissentient; harmonious; as, the assembly was unanimous; the members of the council were unanimous. ``Both in one faith unanimous.''
--Milton.Formed with unanimity; indicating unanimity; having the agreement and consent of all; agreed upon without the opposition or contradiction of any; as, a unanimous opinion; a unanimous vote. [1913 Webster] -- U*nan"i*mous*ly, adv. -- U*nan"i*mous*ness, n.
Wiktionary
unanimousness
n. The state or condition of being unanimous.