All 7 Uses

factor
in
Change of Heart, by Picoult
(Auto-generated)

There are a whole bunch of factors on this list.†

factors = things that affect a result or outcome
Because there's also a column C. MITIGATING FACTORS.†
Other factors in the defendant's background mitigate against the death sentence.†
Because A + B—the factors that had led to the deaths of Kurt and Eliza beth Nealon—would always be greater than C. You couldn't bring them back, and there was no sob story in the world big enough to erase that truth.†
*
It's said to be cheaper to execute a man than to keep him in prison for life—but in fact, when you factor in the cost of eleven years of appeals, paid for with public funds, it costs about a third more to execute a prisoner than to sentence him to life in prison.
*

factor = include consideration of (for the affect on a result or outcome)
That's column A. Then we need to see whether any other aggravating factor fits from column B. Like, the youth of the victim—that works for Elizabeth, right?†
Maureen was the last, but the minute she did, I circled that factor on the white board.†

Definitions:

(1) (factor as in: It was the deciding factor.)
something that affects a result or outcome

You also may encounter x-factor or x factor--meaning "the most important thing that influences a result or outcome."
(2) (factor as in: factor it into your thinking)
include consideration of
(3) (meaning too rare to warrant focus)
There are many specialized meanings in fields such as mathematics, business, finance, biology, and grammar.