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In agreement. They need to be at one when they choose their wedding date.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
In agreement, in harmony, as in John and Pat were at one on every subject except her cat, which made him sneeze, or Springtime always makes me feel at one with nature. [1300s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(be) at ˈone (with somebody/something)(formal) feel that you completely agree with somebody/something, or that you are part of something: Both political parties are at one on the question of foreign imports. ♢ This is the kind of place where you can feel at one with nature.
Farlex Partner Idioms Dictionary © Farlex 2017
In accord or unity.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.