(Latin: different, diversity, change, changing)

Believed by some etymologists to be from varus, "bent, knock-kneed; to bend, to turn, to twist".

unvaryingly (adverb), more unvaryingly, most unvaryingly
Descriptive of being constant and not changing: Every time Joe goes to the restaurant, the waiters and waitresses are unvaryingly polite and friendly.
vair (s) (noun) (apparently there is no plural)
1. A typically bluish-gray fur that is obtained from a variety of squirrels used in the 13t and 14th centuries as a lining or trimming for garments.
2. Fur that was used in heraldry to represented interlockig rows of shield-shaped or bell-shaped figures that are alternately blue and white; as, a tincture.
3. Etymology: from Middle English via Old French; from Latin varius, "changing, diverse".
variability (s) (noun), variabilities (pl)
The quality of being changeable: Sometimes weather can be quite unpredictable and is known for its variability when sunshine quickly disappears and dark clouds, wind, and rain roll through and then sunshine again!
variable (s) (noun), variables (pl)
1. Something that changes or which can be changed or which tends to change: There are just too many unemployment and other economic variables.
2. In mathematics, a quantity which can have any one of a set of values or a symbol that represents such a quantity or a number which can change depending on the other numbers in an equation.
variable (adjective), more variable, most variable
1. Indicating a tendency to deviate, as from a normal or recognized type; aberrant; a description of a species that tends to differ in some way from what is usual: The weather in many areas of the country seems to be quite variable because one day it is nice and warm and then the next day it is gray with cold winds!
2. Characteristic of something that is able, or liable, to change suddenly and unpredictably, or likely to change often: The stock market has variable investments with profits going up and then down, often as a result of statements made by certain government agencies.
3. Descriptive of anything that is inconsistent or uneven in quality or performance; not always the same: Joan's savings account has a variable interest rate which fluctuates daily. 
A changeable or inconsistent .
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variable-pitch (s) (noun), variable-pitches (pl)
A type of wind turbine for which for which the attack angle of the rotor blades can be adjusted, either automatically or manually, in order to respond efficiently to variations in wind speed and direction.
variable-pitch propeller (s) (noun), variable-pitch propellers (pl)
A part of a machine in which the angle of the blades of a power-driven shaft can be adjusted to suit different conditions while maintaining the same engine speed.
variable-speed (s) (noun), variable-speeds (pl)
Describing a wind turbine in which the rotor speed increases and decreases with changing wind forces, producing electricity with a fluctuating level of power and voltage.

Contrasted with a fixed-speed turbine, which has a virtually constant rotor speed; typically a 1-2% variation.

variable-torque load (s) (noun), variable-torque loads (pl)
A load that requires low torque at low speeds and increasing torque as the speed is increased, with very high torque being required at high speeds.
variably (adverb), more variably, most variably
Pertaining to how something changes or fluctuates; inconsistently: Chuck was upset that his teacher imposed the rules in the classroom variably, depending on who was meant.

The weather changed variably, with wind and rain, making their bike tour very difficult!

variance (s) (noun), variances (pl)
1. A change that takes place or occurs in something: The variance of the interest rate on Steven’s savings account at the bank showed 1,0% in January and only 0.5% in June!
2. The difference between two or more things: Joe and his wife noticed a variance in the quality of fabric of the curtains they were interested in buying; one was very thin, translucent, and light weight; while the other one was heavier, quite densely woven, and kept the daylight out.
3. A disagreement of ideas or attitudes: The building project was being delayed because of variances of opinions between the supervisors about how to proceed to the next phase.
4. An official decision or document which allows a person to do something that is not normally allowed in legal procedures: Mario had to obtain a variance from the court to connect a garage onto his house.

If there is evidence by a plaintiff which does not agree with the allegations by legal authorities, it is considered to be a legal variance.

5. Etymology: from French via Latin variatia, "a difference, a diversity"; from variantem, "a change".
A discord and a lack of harmony because of disagreements.
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A different opinion or a dispute about an issue.
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variant (s) (noun), variants (pl)
variant (adjective), more variant, most variant
variation (s) (noun), variations (pl)
variative (adjective), more variative, most variative

Inter-related cross references, directly or indirectly, involving word units meaning "another, other, different, alternating, varied, changing": ali-; allo-; alter-; allelo-; hetero-; mut-; poikilo-; reciproc-.