رباعي

Arabic

Etymology

Relative adjective (nisba) composed of رُبَاع‎ (rubāʿ, “four at a time”) +‎ ـِيّ‎ (-iyy), from the root ر ب ع‎ (r-b-ʿ); related to the numeral أَرْبَعَة‎ (ʾarbaʿa, “four”).

Adjective

رُبَاعِيّ • (rubāʿiyy) m, fem رُبَاعِيَّة‎ (rubāʿiyya), masc pl رُبَاعِيُّون‎ (rubāʿiyyūn), fem pl رُبَاعِيَّات‎ (rubāʿiyyāt)

consisting of four, quadripartite, fourfold, quadruple
(geometry) quadrangular
(geometry) tetragonal
(grammar, linguistics) consisting of four radical letters, quadriliteral

Declension

Declension of adjective رُبَاعِيّ (rubāʿiyy)

Singular	Masculine		Feminine
	basic singular triptote		singular triptote in ـَة (-a)
	Indefinite	Definite	Indefinite	Definite
Informal	رُبَاعِي rubāʿī	الرُّبَاعِي‎ ar-rubāʿī	رُبَاعِيَّة‎ rubāʿiyya	الرُّبَاعِيَّة‎ ar-rubāʿiyya
Nominative	رُبَاعِيٌّ rubāʿiyyun	الرُّبَاعِيُّ‎ ar-rubāʿiyyu	رُبَاعِيَّةٌ‎ rubāʿiyyatun	الرُّبَاعِيَّةُ‎ ar-rubāʿiyyatu
Accusative	رُبَاعِيًّا‎ rubāʿiyyan	الرُّبَاعِيَّ‎ ar-rubāʿiyya	رُبَاعِيَّةً‎ rubāʿiyyatan	الرُّبَاعِيَّةَ‎ ar-rubāʿiyyata
Genitive	رُبَاعِيٍّ rubāʿiyyin	الرُّبَاعِيِّ‎ ar-rubāʿiyyi	رُبَاعِيَّةٍ‎ rubāʿiyyatin	الرُّبَاعِيَّةِ‎ ar-rubāʿiyyati
Dual	Masculine		Feminine
Dual	Indefinite	Definite	Indefinite	Definite
Informal	رُبَاعِيَّيْن‎ rubāʿiyyayn	الرُّبَاعِيَّيْن‎ ar-rubāʿiyyayn	رُبَاعِيَّتَيْن‎ rubāʿiyyatayn	الرُّبَاعِيَّتَيْن‎ ar-rubāʿiyyatayn
Nominative	رُبَاعِيَّانِ‎ rubāʿiyyāni	الرُّبَاعِيَّانِ‎ ar-rubāʿiyyāni	رُبَاعِيَّتَانِ‎ rubāʿiyyatāni	الرُّبَاعِيَّتَانِ‎ ar-rubāʿiyyatāni
Accusative	رُبَاعِيَّيْنِ‎ rubāʿiyyayni	الرُّبَاعِيَّيْنِ‎ ar-rubāʿiyyayni	رُبَاعِيَّتَيْنِ‎ rubāʿiyyatayni	الرُّبَاعِيَّتَيْنِ‎ ar-rubāʿiyyatayni
Genitive	رُبَاعِيَّيْنِ‎ rubāʿiyyayni	الرُّبَاعِيَّيْنِ‎ ar-rubāʿiyyayni	رُبَاعِيَّتَيْنِ‎ rubāʿiyyatayni	الرُّبَاعِيَّتَيْنِ‎ ar-rubāʿiyyatayni
Plural	Masculine		Feminine
	sound masculine plural		sound feminine plural
	Indefinite	Definite	Indefinite	Definite
Informal	رُبَاعِيِّين‎ rubāʿiyyīn	الرُّبَاعِيِّين‎ ar-rubāʿiyyīn	رُبَاعِيَّات‎ rubāʿiyyāt	الرُّبَاعِيَّات‎ ar-rubāʿiyyāt
Nominative	رُبَاعِيُّونَ‎ rubāʿiyyūna	الرُّبَاعِيُّونَ‎ ar-rubāʿiyyūna	رُبَاعِيَّاتٌ‎ rubāʿiyyātun	الرُّبَاعِيَّاتُ‎ ar-rubāʿiyyātu
Accusative	رُبَاعِيِّينَ‎ rubāʿiyyīna	الرُّبَاعِيِّينَ‎ ar-rubāʿiyyīna	رُبَاعِيَّاتٍ‎ rubāʿiyyātin	الرُّبَاعِيَّاتِ‎ ar-rubāʿiyyāti
Genitive	رُبَاعِيِّينَ‎ rubāʿiyyīna	الرُّبَاعِيِّينَ‎ ar-rubāʿiyyīna	رُبَاعِيَّاتٍ‎ rubāʿiyyātin	الرُّبَاعِيَّاتِ‎ ar-rubāʿiyyāti

Derived terms

رُبَاعِيّ الأَضْلَاع‎ (rubāʿiyy al-ʾaḍlāʿ), رُبَاعِيّ الْجَوَانِب‎ (rubāʿiyy al-jawānib, “quadrilateral”)

Noun

رُبَاعِيّ • (rubāʿiyy) m, pl رُبَاعِيُّون‎ (rubāʿiyyūn) or رُبَاعِيَّات‎ (rubāʿiyyāt), fem رُبَاعِيَّة‎ (rubāʿiyya)

Usage notes

The meaning “quatrain” uses the plural رُبَاعِيَّات‎ (rubāʿiyyāt).

Declension

Declension of noun رُبَاعِيّ (rubāʿiyy)

Singular	basic singular triptote
Singular	Indefinite	Definite	Construct
Informal	رُبَاعِي rubāʿī	الرُّبَاعِي‎ ar-rubāʿī	رُبَاعِي rubāʿī
Nominative	رُبَاعِيٌّ rubāʿiyyun	الرُّبَاعِيُّ‎ ar-rubāʿiyyu	رُبَاعِيُّ rubāʿiyyu
Accusative	رُبَاعِيًّا‎ rubāʿiyyan	الرُّبَاعِيَّ‎ ar-rubāʿiyya	رُبَاعِيَّ rubāʿiyya
Genitive	رُبَاعِيٍّ rubāʿiyyin	الرُّبَاعِيِّ‎ ar-rubāʿiyyi	رُبَاعِيِّ rubāʿiyyi
Dual	Indefinite	Definite	Construct
Informal	رُبَاعِيَّيْن‎ rubāʿiyyayn	الرُّبَاعِيَّيْن‎ ar-rubāʿiyyayn	رُبَاعِيَّيْ‎ rubāʿiyyay
Nominative	رُبَاعِيَّانِ‎ rubāʿiyyāni	الرُّبَاعِيَّانِ‎ ar-rubāʿiyyāni	رُبَاعِيَّا‎ rubāʿiyyā
Accusative	رُبَاعِيَّيْنِ‎ rubāʿiyyayni	الرُّبَاعِيَّيْنِ‎ ar-rubāʿiyyayni	رُبَاعِيَّيْ‎ rubāʿiyyay
Genitive	رُبَاعِيَّيْنِ‎ rubāʿiyyayni	الرُّبَاعِيَّيْنِ‎ ar-rubāʿiyyayni	رُبَاعِيَّيْ‎ rubāʿiyyay
Plural	sound masculine plural
Plural	Indefinite	Definite	Construct
Informal	رُبَاعِيِّين‎ rubāʿiyyīn	الرُّبَاعِيِّين‎ ar-rubāʿiyyīn	رُبَاعِيِّي‎ rubāʿiyyī
Nominative	رُبَاعِيُّونَ‎ rubāʿiyyūna	الرُّبَاعِيُّونَ‎ ar-rubāʿiyyūna	رُبَاعِيُّو‎ rubāʿiyyū
Accusative	رُبَاعِيِّينَ‎ rubāʿiyyīna	الرُّبَاعِيِّينَ‎ ar-rubāʿiyyīna	رُبَاعِيِّي‎ rubāʿiyyī
Genitive	رُبَاعِيِّينَ‎ rubāʿiyyīna	الرُّبَاعِيِّينَ‎ ar-rubāʿiyyīna	رُبَاعِيِّي‎ rubāʿiyyī

Descendants

English: rubai
Persian: رباعی‎ (robâ'i)

References

Wehr, Hans (1979), “ربع”, in J. Milton Cowan, editor, A Dictionary of Modern Written Arabic, 4th edition, Ithaca, NY: Spoken Language Services, →ISBN

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