factor in

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1. One that actively contributes to an accomplishment, result, or process: "Surprise is the greatest factor in war" (Tom Clancy). See Synonyms at element.
a. One who acts for someone else; an agent.
b. One who purchases accounts receivable at a discount.
3. Mathematics One of two or more quantities that divides a given quantity without a remainder. For example, 2 and 3 are factors of 6; a and b are factors of ab.
4. A quantity by which a stated quantity is multiplied or divided, so as to indicate an increase or decrease in a measurement: The rate increased by a factor of ten.
5. A gene. No longer in technical usage.
6. Physiology A substance that functions in a specific biochemical reaction or bodily process, such as blood coagulation.
v. fac·tored, fac·tor·ing, fac·tors
To determine or indicate explicitly the factors of: If you factor 70, you get 2, 5, and 7.
To engage in purchasing accounts receivable at a discount.
Phrasal Verb:
factor in
To figure in: factored vacations in when preparing the schedule.

[Middle English factour, perpetrator, agent, from Old French facteur, from Latin factor, maker, from facere, to make; see dhē- in Indo-European roots.]

fac′tor·a·ble adj.
fac′tor·ship′ n.

factor in

(Mathematics) (tr, adverb) chiefly US to take account of (something) when making a calculation
ThesaurusAntonymsRelated WordsSynonymsLegend:
Verb1.factor in - consider as relevant when making a decision; "You must factor in the recent developments"
consider, study - give careful consideration to; "consider the possibility of moving"
2.factor in - resolve into factors; "a quantum computer can factor the number 15"
arithmetic - the branch of pure mathematics dealing with the theory of numerical calculations
compute, calculate, cipher, cypher, figure, reckon, work out - make a mathematical calculation or computation

w>factor in

vt sep (esp US) → berücksichtigen; to factor something into somethingetw in etw (acc)mit einbeziehen
References in classic literature ?
The majority of the younger men envied him for just what was the most irksome factor in his love--the exalted position of Karenin, and the consequent publicity of their connection in society.
A client is to me a mere unit,--a factor in a problem.
9 The p105/p50 isoforms of the NF-Bfamily, denoted NF-B1, represents the most ubiquitous form of transcription factor in the family.