al·i·ment (?l??-m?nt)n.1. Something that nourishes; food.2. Something that supports or sustains.tr.v. (-m?nt?) al·i·ment·ed, al·i·ment·ing, al·i·ments To supply with sustenance, such as food: required by court order to aliment the abandoned family.[Middle English, from Latin alimentum, from alere, to nourish; see al- in Indo-European roots.]al?i·men?tal (-m?n?tl) adj.al?i·men?tal·ly adv.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.