All 3 Uses

factor
in
A Hologram for the King
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And so they shared their frustrations of being at the mercy of factors out of their control, too many to count.†
p. 230.1 *

factors = things that affect a result or outcome
Quickly he was in a room in Boston, meeting with Eric Ingvall, who was asking what went wrong, why he hadn't anticipated this, factored in that.†
p. 306.9 *

factored = considered (for affect on a result or outcome)
And the factor that seemed to move his proposal from risky to toxic was not American infrastructure, or the market for American-made goods, or the competition from China.†
p. 143.7

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.