umlaut (phon.): a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound.

ابدال صائتي

Unaccented (phon.):  a word, having no diacritical mark; of a vowel or syllable, pronounced with no, or little stress.

غير منبور

uncial writing (graph.): is a majuscule script commonly used from the 3rd to 8th centuries AD by Latin and Greek scribes.

كتابة انشية

Uncountability (gramm.):  noun has no plural form and cannot be counted in individual units.

لا معدودية

Underworld language (comm.): secret language understood by certain people.

لغة سرية

Ungrammatical (gramm.): not grammatical; not conforming to the rules of grammar or accepted usage.

لا نحوي

unilateral (phon.): Sound that One-sided in the mouth during articulation.

أحادي الجانب

Universal grammar (gramm.): is a theory of linguistics postulating principles of grammar shared by all languages.

نحو العالمي

Universal language (comm.): an international language understood by all.

لغة عالمية

Unstressed (phon.): not bearing a stress or accent.

غير منبور

Upper case letter (graph.):  capital: one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis.

حرف كبير

Upper jaw (physio.): the upper mouth.

الفك الأعلى

Usage (comm.):  the customary manner in which a language (or a form of a language) is spoken or written.

استعمال

Utterance (ling.):  something that is said in a particular context. It is bound to time and palce.

قول