α

α

1. (electrodynamics) The fine structure constant.
   1. (in our Universe) a value of approximately 1/137 = 0.0072973525
2. (classical mechanics) Represents angular acceleration.

   See Wikipedia article on angular acceleration for usage.

3. (chemistry) Used in chemical nomenclature.

   α-lactam has a three-membered ring structure.

4. (astronomy) Used to identify some bright star, usually the brightest star, of a constellation, for instance α-Centauri.
5. (topology) Alexandroff compactification.
6. (UPA) An open back rounded vowel (IPA [ɒ]).
7. (graph theory) independence number

• α-naphthol
• α̈

• alpha (for names of this symbol in other language)

α

1. (astronomy) right ascension

   Coordinate term: δ

IPA^(key): /a/

α (a) (upper case A, lower case α)

1. The first letter of the Arvanitic Albanian Greek-script alphabet.

• (Greek-script letters) Α α, Β β, Ƃ ƅ, Γ γ, Γϳ γϳ, Δ δ, D d, Ε ε, Ε̱ ε̱, Ζ ζ, Ζ̇ ζ̇, Θ θ, Ι ι, Ϳ ϳ, Κ κ, Κ̇ κ̇, Λ λ, ΛΛ λλ, Λ̇ λ̇, Μ μ, Ν ν, Ν̇ ν̇, Ο ο, Π π, Ρ ρ, Ρ̇ ρ̇, Σ σ, Σ̈ σ̈, Τ τ, Ȣ ȣ, Υ υ, Φ φ, Χ χ, Χ̇ χ̇, ΤΣ τσ, ΤΣ̈ τσ̈, DΣ dσ, DΣ̈ dσ̈
• (Latin-script letters) shkronjë; A a, B b, C c, Ç ç, D d, Dh dh, E e, Ë ë, F f, G g, Gj gj, H h, I i, J j, K k, L l, Ll ll, M m, N n, Nj nj, O o, P p, Q q, R r, Rr rr, S s, Sh sh, T t, Th th, U u, V v, X x, Xh xh, Y y, Z z, Zh zh

Derived from its majuscule counterpart Α, from the Phoenician letter 𐤀, aleph.

α • (a) (lowercase, uppercase Α)

1. Lower-case alpha (ἄλφα), the first letter of the ancient Greek alphabet. It represented the open front or central unrounded vowel /a/. It is followed by β.

See also alpha

• α' (a'), ,α (,a)
• a, A (Roman)
• а, А (Cyrillic)
• 𐌰 (Gothic)
• ⲁ, Ⲁ (Coptic)

• (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 ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Derived from its Ancient Greek majuscule counterpart Α (A, “Alpha”), in turn from the Phoenician letter 𐤀 (“aleph”).

α • (a) (lower case, upper case Α)

1. Lower-case άλφα (álfa, “alpha”), the first letter of the modern Greek alphabet. Represents the open front unrounded vowel: /a/.

• Ancient Greek, however, did not distinguish between upper case and lower case. See Α (A) for details.

• α΄ (“one, 1”)
• ,α (,a, “one thousand, 1,000”)

• Appendix:Greek alphabet

From Ancient Greek ἆ (â).

α! • (a!)

1. Expresses wonder, surprise or joy; ah, ooh, oh, wow:

   Α, τι πανέμορφη θέα!

   A, ti panémorfi théa!

   Wow, what a gorgeous view!

   Α, δεν σε περίμενα! Ποτέ έφτασες;

   A, den se perímena! Poté éftases?

   Oh, I wasn't expecting you! When did you get here?

2. Expresses desire or wish; oh:

   Α και να ερχόταν να με δει!

   A kai na erchótan na me dei!

   Oh, if only he would come to see me!

3. Expresses anger or threat; oh:

   Α που να σε πάρει ο διάολος!

   A pou na se párei o diáolos!

   Oh, the devil take you!

   Α έτσι μου είσαι; Θα δεις εσύ τώρα!

   A étsi mou eísai? Tha deis esý tóra!

   Oh, so that's how it is? Wait till you see!

4. Expresses impatience; oh, ah:

   Α δεν μπορώ να περιμένω άλλο!

   A den boró na periméno állo!

   Ah, I can't wait any longer!

5. Expresses confirmation of a fact; oh, ah:

   Α ναι βεβαίως ήταν αυτός!

   A nai vevaíos ítan aftós!

   Ah, yes, of course it was him!

6. Expresses desire against; oh, ah:

   Α όχι αυτός πάλι!

   A óchi aftós páli!

   Oh, not him again!

7. Answer word, can be either positive or negative; eh, meh:

   Θα ’ρθεις απόψε στο πάρτι; Α, μπα!

   Tha ’rtheis apópse sto párti? A, ba!

   Will you be coming to the party tonight? Ah, nah!

   Ωραίο δεν ήταν το έργο; Α, καλό ήταν!

   Oraío den ítan to érgo? A, kaló ítan!

   Wasn't the film nice? Eh, it was good!

8. Answer word of indifference; meh:

   Πως πάει το σχόλιο τελευταία; Α, έτσι κι έτσι!

   Pos páei to schólio teleftaía? A, étsi ki étsi!

   How's school going lately? Meh, so-so!

From άι < άε from Ancient Greek ἄγε sg (áge, “go!”, pres.imp.) (with deletion of ‑γ-) of verb ἄγω (“I lead”).^[1][2] Also see etymologies of άντε, άιντε, άμε.

• άι (ái) (uncontracted)

• and see: άντε for interchangeable interjections for dismissal

α • (a)

1. (colloquial) Contraction of άντε (ánte).

   Α να χαθείς!

   A na chatheís!

   Oh, get lost!

   Α στο καλό πια, σε βαρέθηκα!

   A sto kaló pia, se varéthika!

   Oh go away will you, I'm sick of you!

• α να χαθείς (a na chatheís, “get lost!”)
• α στο διάολο (a sto diáolo, “go to the devil (to hell)!”)
• α στο καλό (a sto kaló, “go to what is good (with multiple senses)”)
• and see Greek dismissals

• IPA^(key): /a/

From Doric Greek ᾱ̔ (hā) (Attic Greek ἡ (hē)), from Proto-Indo-European *séh₂.

α (a) f sg

1. feminine nominative singular of ο (o)

α (a) (lower case, upper case Α)

1. The first letter of the Tsakonian alphabet.

• (Greek script letters) Α (A) α (a), Α̈ (Ä) α̈ (ä), Ά (Á) ά (á), Β (V) β (v), Γ (G) γ (g), Δ (D) δ (d), Ε (E) ε (e), Έ (É) έ (é), Ζ (Z) ζ (z), Ζ̌ (Ž) ζ̌ (ž), Ζ̑ (Z̑) ζ̑ (z̑), Η (I) η (i), Ή (Í) ή (í), Θ (Th) θ (th), Ι (I) ι (i), Ί (Í) ί (í), Ϊ ϊ (ï), ΐ (ḯ), Κ (K) κ (k), Κ̀ (K̀) κ̔ (k̔), Λ (L) λ (l), Λ̣ (Ḷ) λ̣ (ḷ), Λ̑ (L̑) λ̑ (l̑), Μ (M) μ (m), Ν (N) ν (n), Ν̇ (Ṅ) ν̇ (ṅ), Ν̑ (N̑) ν̑ (n̑), Ξ (X) ξ (x), Ο (O) ο (o), Ό (Ó) ό (ó), Π (P) π (p), Π̀ (P̀) π̔ (p̔), Ρ (R) ρ (r), Σ (S) σ (s) ς (s), Σ̌ (Š) σ̌ (š) ς̌ (š), Σ̑ (S̑) σ̑ (s̑) ς̑ (s̑), Τ (T) τ (t), Τ̀ (T̀) τ̔ (t̔), Τζ (Tz) τζ (tz), Τσ (Ts) τσ (ts) τς (ts), Υ (Y) υ (y), Ύ (Ý) ύ (ý), Ϋ ϋ (ÿ), ΰ (ÿ́), Φ (F) φ (f), Χ (Ch) χ (ch), Ψ (Ps) ψ (ps), Ω (O) ω (o), Ώ (Ó) ώ (ó)