factor in

factor in idiom
Figure in, include as a basic element. For example, In preparing the schedule we factored in vacation and sick days. This term comes from mathematics. [Mid-1900s]

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.

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