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An affix added to the end of a word or stem, serving to form a new word or functioning as an inflectional ending, such as -ness in gentleness, -ing in walking, or -s in sits.
tr.v. suf·fixed, suf·fix·ing, suf·fix·es
To add as a suffix.

[New Latin suffīxum, from Latin, neuter of suffīxus, past participle of suffīgere, to fasten underneath, affix : sub-, sub- + fīgere, to fix, fasten; see dhīgw- in Indo-European roots.]

suf′fix·al adj.
suf′fix·al·ly adv.
suf′fix·a′tion (sŭf′ĭk-sā′shən), suf·fix′ion (sə-fĭk′shən) n.
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.