verb, -ized, -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. |
| 3. | to compute an income-tax return by listing separately all assets, credits, allowable deductions, losses, etc. |