at one Meaning, Definition & Usage

At one"
Etymology
OE. at on, atone, atoon, attone.
Definitions
  1. In concord or friendship; in agreement (with each other); as, to be, bring, make, or set, at one, i. e., to be or bring in or to a state of agreement or reconciliation.
    If gentil men, or othere of hir contree Were wrothe, she wolde bringen hem atoon. Chaucer.
  2. Of the same opinion; agreed; as, on these points we are at one.
  3. Together. Obs. Spenser.
    He and Aufidius can no more atone Than violentest contrariety. Shak.
  4. To stand as an equivalent; to make reparation, compensation, or amends, for an offense or a crime.
    The murderer fell, and blood atoned for blood. Pope.
    The ministry not atoning for their former conduct by any wise or popular measure. Junius.

Webster 1913