Find a comprehensive list of math words starting with the letter “A” to aid in your studies and understanding.

- Abacus – A counting tool.
- Absolute Value – Distance from zero on a number line.
- Acute Angle – Angle less than 90 degrees.
- Addend – A number involved in addition.
- Addition – Combining quantities.
- Algebra – Branch of math with symbols.
**Algorithm – Step-**by-step procedure.- Alternate Angles – Angles on opposite sides of a transversal.
- Altitude – Height from base to top.
- Amplitude – Maximum extent of a wave.
- Angle – Formed by two rays at a vertex.
- Annual – Occurring yearly.
- Antipodal – Opposite points on a sphere.
- Approximation – Estimate close to exact value.
- Area – Space within a shape.
- Arithmetic – Study of numbers and operations.
- Array – Arrangement in rows and columns.
- Asymptote – Line approaches a curve.
- Axis – Reference line in a graph.
- Average – Sum of values divided by count.
- Angle Bisector – Line dividing an angle equally.
- Associative Property – Grouping in addition/multiplication.
**Axiom – Self-**evident truth in math.- Additive Inverse – Number that sums to zero.
- Arccosine – Inverse of cosine function.
- Arc – Part of a curve.
- Arccotangent – Inverse of cotangent function.
- Archimedes’ Principle – Buoyant force theory.
- Arithmetic Mean – Sum divided by the number of items.
- Array – Ordered collection of elements.
- Arctangent – Inverse of tangent function.
- Arithmetic Progression – Sequence with constant difference.
- Adjacent Angles – Share a common side.
- Average Deviation – Mean of absolute deviations.
- Additive Identity – Number that adds to itself unchanged.
- Affine Transformation – Linear mapping with translation.
**Annulus – Ring-**shaped object.- Antilogarithm – Inverse process of logarithm.
- Argand Diagram – Complex plane representation.
- Arithmetic Series – Sum of an arithmetic sequence.

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