[n. suhf-iks; v. suhf-iks, suh-fiks]
Grammar. an affix that follows the element to which it is added, as -ly in kindly.
something added to the end of something else.
verb (used with object)
Grammar. to add as a suffix.
to affix at the end of something.
to fix or put under.
verb (used without object) Grammar.
to admit a suffix.
to add a suffix.

1595–1605; < Neo-Latin suffixum, noun use of neuter of Latin suffixus (past participle of suffīgere to attach on top of), equivalent to suf- suf- + fixus (see fix)

suffixal [suhf-ik-suhl, suh-fik-] , adjective
suffixation [suhf-ik-sey-shuhn] , suffixion [suh-fik-shuhn] , noun
unsuffixed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  grammar Compare prefix an affix that follows the stem to which it is attached, as for example -s and -ness in dogs and softness
2.  anything that is added at the end of something else
3.  (tr) grammar to add (a morpheme) as a suffix to the end of a word
4.  (tr) to add (something) at the end of a sentence, comment, or piece of writing
[C18: from New Latin suffixum, from Latin suffixus fastened below, from suffīgere, from sub- + fīgere to fasten]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1778, from Mod.L. suffixum, noun use of neut. of L. suffixus "fastened," pp. of suffigere "fasten, fix on," from sub "upon" + figere "fasten" (see fix). The verb, in the grammatical sense, is first recorded 1778.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

suffix definition

A letter or a group of letters added to the end of a word to change its meaning. For example, adding the suffix -ter to the adjective hot turns it into the comparative adjective hotter, and adding the suffix -ly to the adjective quick turns it into the adverb quickly. Other examples of words with suffixes are: “willing,” “management,” “serviceable,” “harmonize,” and “joyful.” (Compare prefix.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Planets orbiting stars beyond the sun are labelled merely with the name of the star and a suffix letter.
Given time, the internal geography shifts, and the cities of the new homeland take the suffix due the cities of the old one.
Determine whether each of the word elements listed below is a root or suffix.
Without this suffix, a countable noun is understood to be singular.
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