neologism

n. new expression; new word; modern usage of words or expressions

A neologism is a word, term, or phrase which has been recently created ("coined") — often to apply to new concepts, to synthesize pre-existing concepts, or to make older terminology sound more contemporary. Neologisms are especially useful in identifying  inventions, new phenomena, or old ideas which have taken on a new cultural context. The term "e-mail", as used today, is an example of a neologism.
See more at Wikipedia.org...

Neologism /ne·ol·o·gism/ a newly coined word; in psychiatry, a new word whose meaning may be known only to the patient using it. ne·ol·o·gism n. [more]Neologism - Community and Resources

Noun
1. a newly invented word or phrase
(synonym) neology, coinage
(hypernym) word
(hyponym) blend, portmanteau word, portmanteau
2. the act of inventing a word or phrase
(synonym) neology, coinage
(hypernym) invention

(n.)
The introduction of new words, or the use of old words in a new sense.
  

(n.)
A new word, phrase, or expression.
  

(n.)
A new doctrine; specifically, rationalism.