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once and again
From The Collaborative International Dictionary of English v.0.48:
Once \Once\ (w[u^]ns), adv. [OE. ones, anes, an adverbial form fr. one, on, an, one. See One-, -Wards.] 1. For one time; by limitation to the number one; not twice nor any number of times more than one. [1913 Webster] Ye shall . . . go round about the city once. --Josh. vi. 3. [1913 Webster] Trees that bear mast are fruitful but once in two years. --Bacon. [1913 Webster] 2. At some one period of time; -- used indefinitely. [1913 Webster] My soul had once some foolish fondness for thee. --Addison. [1913 Webster] That court which we shall once govern. --Bp. Hall. [1913 Webster] 3. At any one time; -- often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched. [1913 Webster] Wilt thou not be made clean? When shall it once be? --Jer. xiii. 27. [1913 Webster] To be once in doubt Is once to be resolved. --Shak. [1913 Webster] Note: Once is used as a noun when preceded by this or that; as, this once, that once. It is also sometimes used elliptically, like an adjective, for once-existing. "The once province of Britain." --J. N. Pomeroy. [1913 Webster] At once. (a) At the same point of time; immediately; without delay. "Stand not upon the order of your going, but go at once." --Shak. "I . . . withdrew at once and altogether." --Jeffrey. (b) At one and the same time; simultaneously; in one body; as, they all moved at once. Once and again, once and once more; repeatedly. "A dove sent forth once and again, to spy." --Milton. [1913 Webster]