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The Morphological Features Tag Set captures long-established traditional morphological features of Arabic, in a compact yet transparent notation. A tag consists of 22 characters; each position represents a feature and the letter at that location represents a value or attribute of the morphological feature; the dash “-“ represents a feature not relevant to a given word. The first character shows the main Parts of Speech, from: noun, verb, particle, punctuation, residual; these last two are an extension to the traditional three classes to handle modern texts. The characters 2, 3, and 4 are used to represent subcategories; traditional Arabic grammar recognizes 29 subclasses of noun (letter 2), 3 subclasses of verb (letter 3), 13 subclasses of particle (letter 4). residuals and punctuations are represented in letters 5 and 6 respectively. The next letters represent traditional morphological features: gender (7), number (8), person (9), morphology (10) case & mood (11), case & mood markers (12), definiteness (13), voice (14), emphasized (15), transitivity (16), humanness (17), Variability & Conjungation (18). Finally there are four characters representing morphological information which is useful in Arabic text analysis, although not all linguists would count these as traditional features: augmented and unaugmented (19), number of root letters (20), verb internal structure (21), noun finals (22). The Morphological Features Tag Set is not tied to a specific tagging algorithm or theory, and other tag sets could be mapped onto this standard, to simplify and promote comparisons between and reuse of Arabic taggers and tagged corpora.

Details of the morphological features Part-of-Speech Tag Set for Arabic language

Morphological Features Categories


Morphological Features Categories


Main Part-of-Speech

أَقسام الكلام الرئيسيَّة


Part-of-Speech of Noun

أقسام الكلام الفرعيَّة (الاسم)


Part-of-Speech of Verb

أقسام الكلام الفرعيَّة (الفعل)


Part-of-Speech of Particle

أقسام الكلام الفرعيَّة (الحرف)



أقسام الكلام الفرعيَّة (أخرى)


Punctuation marks

أقسام الكلامالفرعيَّة ( علامات الترقيم)














Case and Mood

الحالة الإعرابية للاسم أو الفعل


Case and Mood marks

علامة الإعراب أو البناء






المَبْني لِلمَعْلُوم و المَبْني لِلمَجْهُول



المُؤكَّد وغيرُ المُؤكَّد



اللازم والمتعدي



العاقل وغير العاقل


Variability & Conjungation



Augmented and Unaugmented

المجرَّد والمزيد


Root letters

المجرَّد والمزيد


Verb Internal Structure

بُنية الفعل


Noun finals

أقسام الأسم تبعاً للفظ آخره


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