First in order of importance

Množina: alphas

ETYM Latin alpha, Greek alpha, from Hebrew âleph, name of the first letter in the alphabet, also meaning ox.
1. The 1st letter of the Greek alphabet.
2. The beginning of a series or sequence.
First letter (A, a) of Greek alphabet. alpha and omega, first and last; entirely; quintessence. alpha particle, positively charged particle, the nucleus of a helium atom. alpha ray, a ray or beam of alpha. particles. alpha wave, variation in frequency of brain waves associated with drowsiness.
In computing, a 64-bit RISC chip launched 1993 by Digital Equipment (DEC). It was seen as a rival to Intel's Pentium chip.

Množina: alpha and omegas

1. The basic meaning of something; the crucial part.
2. The first and last; signifies God's eternity.
First (a) and last (w) letters of the Greek alphabet, a phrase hence meaning the beginning and end, or sum total, of anything.

Množina: alpha geeks

Množina: alpha particles

A positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes.
The nuclei of a helium (with two neutrons and two protons each) that are discharged by radioactive decay of many heavy elements, such as uranium-238 and plutonium-239.
Positively charged, high-energy particle emitted from the nucleus of a radioactive atom. It is one of the products of the spontaneous disintegration of radioactive elements (see radioactivity) such as radium and thorium, and is identical with the nucleus of a helium atom— that is, it consists of two protons and two neutrons. The process of emission, alpha decay, transforms one element into another, decreasing the atomic (or proton) number by two and the atomic mass (or nucleon number) by four.
Because of their large mass alpha particles have a short range of only a few centimeters in air, and can be stopped by a sheet of paper. They have a strongly ionizing effect (see ionizing radiation) on the molecules that they strike, and are therefore capable of damaging living cells. Alpha particles traveling in a vacuum are deflected slightly by magnetic and electric fields.

Singular of alpha rays is alpha ray.

Množina: alpha tests

The process of user testing that is carried out on a piece of alpha software.
A first test of an experimental product (such as computer software) carried out by the developer.

Množina: alphabets

ETYM Latin alphabetum, from Greek alpha + beta, the first two Greek letters; Hebrew âleph and bete: cf. French alphabet.
A character set that includes letters.
Set of conventional symbols used for writing, based on a correlation between individual symbols and spoken sounds, so called from alpha (a) and beta (b), the names of the first two letters of the classical Greek alphabet. The earliest known alphabet is from Palestine, about 1700 BC. Alphabetic writing now takes many forms—for example, the Hebrew aleph-beth and the Arabic script, both written from right to left; the Devanagari script of the Hindus, in which the symbols “hang” from a line common to all the symbols; and the Greek alphabet, with the first clearly delineated vowel symbols.
Each letter of the alphabets descended from Greek represents a particular sound or sounds, usually grouped into vowels (a, e, i, o, u, in the English version of the Roman alphabet), consonants (b, p, d, t, and so on) and semivowels (w, y). Letters may be combined to produce distinct sounds (for example, a and e in words like tale and take, or o and i together to produce a “wa” sound in the French loi), or may have no sound whatsoever (for example, the silent letters gh in high and through).

Množina: alphabet soups

A hodgepodge especially of initials (as of the names of organizations)

Množina: alphabetarians