A neologism (Greek: νεολογισμός [neologismos], from νέος [neos] new + λόγος [logos] word, speech, discourse + suffix -ισμός [-ismos] -ism) 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.
I invented a neologism today for the "concept" of a regular fuck buddy: "sucknificant other". Will the term make it to Wikipedia?