In morphology and syntax, a clitic or cliticum is a morpheme that is grammatically independent, but phonologically dependent on another word or phrase. It is pronounced like an affix, but works at the phrase level. It never receives a
Clitics may belong to any grammatical category, though they are commonly pronouns, determiners, or adpositions.
Note that orthography is not a good guide for identifying clitics: clitics may be written as independent words, bound affixes, or separated by special characters. For instance an apostrophe.
A proclitic appears before its host.
English: an apple
French: Je t’aime. – I you–love. = I love you
Ancient Greek: ὁ ἄνθρωπος – the person
An enclitic appears after its host.
Latin: Senatus Populusque Romanus – “Senate people-and Roman” = The Senate and Roman people
Ancient Greek: ánthrōpoí (te) theoíte – “people (and) gods and” = (both) men and gods
A mesoclitic appears between the stem of the host and other affixes.
Portuguese: Ela levá–lo–ia. – She take-it–COND. = She would take it.
The endoclitic splits apart the root and is inserted between the two pieces. Endoclitics defy the Lexical Integrity Hypothesis (Lexicalist Hypothesis) and so were long claimed to be impossible, but evidence from the Udi language suggests that they do exist.Endoclitics are also found in languages like Pashto and are reported to exist in Degema.
On a completely different note; in cryptic language-comedy the term has been used to refer to a medical specialist in the branch of gynaecology.