Math Words That Start With A: Key Terms and Definitions

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

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

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