Elision

Elision is the omission of one or more sounds (such as a vowel, a consonant, or a whole syllable) in a word or phrase, producing a result that is easier for the speaker to pronounce. Sometimes, sounds may be elided for euphonic effect.

In Native English, elision comes naturally, and it is often described as "slurred" or "muted." Often, elision is deliberate. It is a common misconception that contractions automatically qualify as elided words, which comes from slack definitions. Not all elided words are contractions and not all contractions are elided words (for example, 'going to' -> gonna: an elision that is not a contraction; 'can not' cannot: a contraction that is not an elision).

In French, elision is mandatory in certain contexts, as in the clause C'est la vie (elided from *cela est la vie).

In Spanish, elision occurs less frequently but is common in certain dialects. Of particular interest is the word para, which becomes pa'. Multiple words can be elided together, as in pa'trabajar for para trabajar and pa'delante or even pa'lante for para adelante.

An example of deliberate elision occurs in Latin poetry as a stylistic device. Under certain circumstances, such as one word ending in a vowel and the following word beginning in a vowel, the words may be elided together. Elision was a common device in the works of Catullus. For example, the opening line of Catullus 3 is: Lugete, O Veneres Cupidinesque, but would be read as Lugeto Veneres Cupidinesque.

A synonym for elision is syncope, though the latter term is most often associated with the elision of vowels between consonants (e.g., Latin tabula → Spanish tabla). Another form of elision is apheresis, which means elision at the beginning of a word (generally of an unstressed vowel).

Some morphemes take the form of elision. See disfix.

The opposite of elision is epenthesis, whereby sounds are inserted into a word to ease pronunciation.

A special form of elision called ecthlipsis is used in Latin poetry when a word ending in the letter "m" is followed by a word beginning with a vowel, e.g., "...et mutam nequiquam adloquerer cinerem." = "...et mutam nequiquadloquerer cinerem." - Catullus 101.

The omission of a word from a phrase or sentence is not elision but ellipsis or, more accurately, elliptical construction.

Read more about Elision:  Written Representation