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A person or thing that precipitates an event or change; in science, a substance that increases the rate of a chemical reaction.

A measure, quantity, or frequency, typically one measured against another quantity or measure; an average.

Factors, elements, or quantities that are liable to vary or change. In research, these are the elements being measured or manipulated.

The state of being intertwined, interconnected, or complicatedly linked. It is used for physical objects (like wires) or abstract concepts (like interests).

A fall in the amount, level, or number of something; the opposite of an increase.

A statement about what you think will happen in the future, often based on data or evidence.

The action of proving something to be true, or evidence that establishes a fact. It is crucial in scientific research and legal contexts.

Done or happening without a specific plan, purpose, or pattern. Often used in statistics to describe sampling methods.

The degree of compactness of a substance; in geography, the number of people or things in a specific area.

The amount or number of something that can be measured or counted. A fundamental word for IELTS Task 1 data description.