What does a stand for?

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly.

Active

A market in which there is much trading.

Accepted

Adenosine

A purine nucleoside found in DNA, RNA, and many cofactors.

Anchor

A metallic device used to connect a vessel to the bed of a body of water to prevent the craft from wind and current OR A restraint applied to eliminate motion and restrain forces. OR Orbit about a specific point; ground track flown by tanker. Information call indicates a turning engagement about a specific location. OR A device that supports and holds in place conductors when they are terminated at a pole or structure.

Anatomy

Anatomy is the branch of biology concerned with the study of the structure of animals and their parts, it is also referred to as zootomy to separate it from human anatomy. In some of its facets, anatomy is related to embryology and comparative anatomy, which itself is closely related to evolutionary biology and phylogeny. Human anatomy is one of the basic essential sciences of medicine.

Analog

As humans, we perceive the world in analog. Everything we see and hear is a continuous transmission of information to our senses. This continuous stream is what defines analog data. Digital information, on the other hand, estimates analog data using only ones and zeros. For example, a turntable (or record player) is an analog device, while a CD player is digital.

Amplitude

The maximum instantaneous value of alternating current or voltage. It can be in either a positive or negative direction. The greatest distance through which an oscillating body moves from the mid point. OR A measure of floor vibration. It is the magnitude or total distance traveled by each oscillation of the vibration. OR A measurement of the distance from highest to lowest excursion of a variable or physical motion. Often used with reference to waveforms.

Alpha

First letter of Greek alphabet. Commonly used as a symbol to denote a known quantity Prefixed to name of a constellation, it denotes principiil star in that constellation