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verb (used with object), i·tem·ized, i·tem·iz·ing.
  1. to state by items; give the particulars of; list the individual units or parts of: to itemize an account.
  2. to list as an item or separate part: to itemize deductions on an income-tax return.
verb (used without object), i·tem·ized, i·tem·iz·ing.
  1. to compute an income-tax return by listing separately all assets, credits, allowable deductions, losses, etc.
Also especially British, i·tem·ise.

Origin of itemize

An Americanism dating back to 1855–60; item + -ize
Related formsi·tem·i·za·tion, nouni·tem·iz·er, nounmis·i·tem·ized, adjectivenon·i·tem·ized, adjectivenon·i·tem·iz·er, nounre·i·tem·ize, verb (used with object), re·i·tem·ized, re·i·tem·iz·ing.un·i·tem·ized, adjectivewell-i·tem·ized, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for itemize



  1. (tr) to put on a list or make a list of
Derived Formsitemization or itemisation, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for itemize

1864, American English, from item + -ize. Related: Itemized; itemizing. Earlier verb was simply item (c.1600).

Online Etymology Dictionary, © 2010 Douglas Harper