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For example,

the estimated spend for Q3 is a million dollars.

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closed as general reference by FumbleFingers, cornbread ninja 麵包忍者, MετάEd, tchrist, kiamlaluno Sep 3 '12 at 23:52

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

+1 I was thinking about this question just this weekend. Also, the proper term for "nounification" is nominalize. :) – Zairja Aug 21 '12 at 18:24
It comes from the verb spend, of course. :) – Robusto Aug 21 '12 at 18:31
You may also want to refer to this blog and the OED entry. The word does have a long history (not slang or business jargon), but has become more popular in business circles in recent decades. a1688; J. Bunyan Israel's Hope Encouraged in Wks. (1855) I. 618; "What if I cannot but live upon the spend all my days, yet, if my friend will always supply my need, is it not well for me?" – Zairja Aug 21 '12 at 18:31
up vote 5 down vote accepted

It comes from the verb spend and according to the Oxford English Dictionary, the noun (the action of spending money or the amount spent) has been used since before 1688, in The works of John Bunyan: with an introduction to each treatise, notes, and a sketch of his life, times, and contemporaries:

What if I cannot but live upon the spend all my days, yet, if my friend will always supply my need, is it not well for me?

Or, specifically as the amount spent, the earliest quotation is from 1976, in Computers in Higher Education & Research:

About £21 million should be spent for universities on new machines, buildings and operating costs..with a spend of about £10 million for research councils for similar purposes.

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