ο

See also: Ο, -ο, -Ο, -ό, ὅ, ὁ, ο̈, and Appendix:Variations of "o"

ο U+03BF, ο GREEK SMALL LETTER OMICRON ← ξ [U+03BE] Greek and Coptic π → [U+03C0]

Character variations

𝜊 U+1D70A, 𝜊 MATHEMATICAL ITALIC SMALL OMICRON ← 𝜉 [U+1D709] Mathematical Alphanumeric Symbols 𝜋 → [U+1D70B]

Translingual

Letter

ο (lower case, upper case Ο)

1. The lower case letter called omicron (όμικρον); The 15th letter of the Greek alphabet.

Symbol

ο’

1. The cardinal number 70 in Greek numerals.

Symbol

,ο

1. The cardinal number 70,000 in Greek numerals.

See also

• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ (W) ϝ (w), Ͷ ͷ, Ͱ (H) ͱ (h), Ϻ (S) ϻ (s), Ϟ ϟ, Ϙ (Q) ϙ (q), Ͳ (S) ͳ (s)
• (punctuation) · ⸳ . ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨
• ο on Wikipedia.Wikipedia

Ancient Greek

Etymology

Derived from its majuscule counterpart Ο.

Letter

ο • (o) (lowercase, uppercase Ο)

1. Lower-case omicron (ὂ μικρόν), the 15th letter of the ancient Greek alphabet. It represented the close-mid back rounded vowel /o/. It is preceded by ξ and followed by π.

Derived terms

See also omicron

• ο΄, ͵ο
• о, О (Cyrillic)
• 𐌿 (Gothic)
• ⲟ, Ⲟ (Coptic)
• օ, Օ (Armenian)

See also

• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ (W) ϝ (w), Ͷ ͷ, Ͱ (H) ͱ (h), Ϻ (S) ϻ (s), Ϟ ϟ, Ϙ (Q) ϙ (q), Ͳ (S) ͳ (s)
• (punctuation) · ⸳ . ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Greek

Alternative forms

• ὁ (o) — polytonic

Etymology

Inherited from Ancient Greek ὁ (ho).

Pronunciation

• IPA^(key): /o̞/

Article

ο • (o) m sg

1. the definite masculine singular article. the

Declension

The definite article

	singular				plural
	masculine	feminine	neuter		masculine	feminine	neuter
nominative	ο (o)	η (i)	το (to)		οι (oi)	οι (oi)	τα (ta)
genitive	του (tou)	της (tis)	του (tou)		των (ton)	των (ton)	των (ton)
accusative	το (to) τον1 (ton1)	τη (ti) την1 (tin1)	το (to)		τους (tous)	τις (tis)	τα (ta)

1. Final ν (n) is preserved before vowels, and the plosive/affricate consonants: κ, π, τ, ξ, ψ, μπ, ντ, γκ, τσ, τζ.
Archaic forms used in certain fixed phrases: τοις (tois), τας (tas).

Pontic Greek

Etymology

From Ancient Greek ὁ (ho).

Pronunciation

• IPA^(key): /o̞/

Article

ο (o) m sg

1. (definite) the

Declension

The definite article

	singular			plural
	m	f	n	m	f	n
nominative	ο	η	το	οι		τα
genitive	τη, του, τση	τη, τση	τη, του, τση	των, τουν, τη		των, τη
accusative	τον	την	το	τους, τσου, τοι, τσοι, τοιν, τοις		τα

• The final vowel is canonically deleted when the next word starts with a vowel. This happens in the nominative case as well.
  
• The final ν is deleted when the next word starts with λ, μ or ρ, or when the next word is μου, σου.
  
• Τhe initial τ becomes σ when preceded by the preposition ας.

Tsakonian

Etymology

From Ancient Greek ὁ (ho).

Pronunciation

• IPA^(key): /o̞/

Article

ο (o) m sg

1. (definite) the

Declension

Tsakonian definite article

	singular			plural
	m	f	n	m	f	n
nominative	ο (o)	α (a)	το (to)	οι (oi)	οι (oi)	τα (ta)
accusative	το (to) τον1 (ton1)	τα (ta) ταν1 (tan1)	το (to)	του (tou) τουρ2 (tour2)	του (tou) τουρ2 (tour2)	τα (ta)
genitive	του (tou)	τα (ta) ταρ2 (tar2)	του (tou)	του (tou) τουν1 (toun1)	του (tou) τουν1 (toun1)	του (tou) τουν1 (toun1)

1. Final ν (n) is preserved vowels, and the plosive/affricate consonants: κ, π, τ, μπ, ντ, γκ, τσ, τζ.
2. Final ρ (r) is preserved before vowels.