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In linguistics, a suffix (also sometimes called a postfix or ending) is an affix which is placed after the stem of a word. Common examples are case endings, which indicate the grammatical case of nouns or adjectives, and verb endings, which form the conjugation of verbs. Particularly in the study of Semitic languages, a suffix is called an afformative, as they can alter the form of the words to which they are fixed. In Indo-European studies, a distinction is made between suffixes and endings (see Proto-Indo-European root).

Suffixes can carry grammatical information (inflectional suffixes) or lexical information (derivational suffixes). An inflectional suffix is sometimes called a desinence.

Some examples from English:

• Girls, where the suffix -s marks the plural.
• He makes, where suffix -s marks the third person singular present tense.
• It closed, where the suffix -ed marks the past tense.

Some inflectional suffixes in present day English:

• -s third person singular present
• -ed past tense
• -ing progressive/continuous
• -en past participle
• -s plural
• -en plural (irregular)
• -er comparative
• -est superlative
• -n't negative

Some good example of common Suffixes:

Suffix	Meaning	Example
-agog, -agogue	leader	demagogue, pedagogue
-cide	kill(ing)	patricide, infanticide, suicide
-ectomy	cutting	appendectomy, splenectomy
-ia, -y	act, state	amnesia, mania, democracy, anarchy
-ic, -tic, -ical, -ac	having to do with	anthropomorphic, dramatic, biblical, cardiac
-ics	things having to do with	optics, physics
-isk, -iscus	small	asterisk
-ism	the belief in	pacifism, terrorism, socialism, communism
-ist	one who believes in	pacifist, terrorist, socialist, communist
-ite	one connected with	meteorite, polite, cosmopolite
-logy	study field of	biology, geology, etymology, cardiology
-oid	resembling, like-shaped	asteroid, spheroid
-or, -er	one who takes part in	doctor, actor, teacher, driver
-phobia	exaggerated fear	photophobia, claustrophobia, agoraphobia
-sis	act, state, condition of	analysis