Math Words That Start with D: Definitions & Examples

In this article, you will find a comprehensive list of math words that start with the letter “D.

  1. Data- Information collected for analysis
  2. Decimal- A number with a point dividing the whole and fractional parts
  3. Degree- Unit of measurement for angles
  4. Denominator- The bottom number in a fraction
  5. Diameter- A straight line passing through the center of a circle
  6. Difference- The result of subtraction
  7. Digit- A single numeral (0-9)
  8. Dimension- A measurable extent of some kind, such as length, breadth, depth, or height
  9. Direct Proportion- A relationship where one quantity increases as another increases
  10. Distributive Property- a(b + c) = ab + ac, distribution over addition or subtraction
  11. Divisor- The number by which another number is divided
  12. Dividend- The number to be divided
  13. Division- The process of determining how many times one number is contained within another
  14. Dodecahedron- A three-dimensional shape with 12 flat faces
  15. Domain- The set of possible input values (x-values) for a function
  16. Diagonal- A line segment joining two non-adjacent vertices of a polygon
  17. Differential- Relating to the difference of quantities
  18. Degree of Polynomial- The highest power of the variable in a polynomial
  19. Dependent Variable- A variable whose value depends on another
  20. Decomposition- Breaking down a number into smaller parts
  21. Deduction- Deriving conclusions through logical reasoning
  22. Degree of a Graph- The number of edges incident to a vertex
  23. Duality- Concept where structures have a complementary counterpart
  24. Disjoint Sets- Sets that have no elements in common
  25. Differential Equation- An equation involving derivatives
  26. Discrete Mathematics- Branch of math dealing with countable, distinct elements
  27. Disjoint- Mutually exclusive or having no intersection
  28. Deviation- Difference from a standard or average
  29. Depreciation- The reduction in value of an asset over time
  30. Directrix- A fixed line used in describing a curve or surface
  31. Dilation- Transformation altering the size but not the shape
  32. Discriminant- Part of the quadratic formula, b² – 4ac
  33. Dot Product- Scalar product of two vectors
  34. Determinant- A value calculated from a square matrix
  35. Derivative- The rate of change of a function with respect to a variable
  36. Distribution- A function showing the range of possible values for a variable
  37. Diophantine Equation- Polynomial equations with integer solutions
  38. Dual Space- Set of linear functionals on a vector space
  39. Directional Derivative- Rate of change of a function in a given direction
  40. Double Integral- Integration over a two-dimensional area
  41. Dynamic- Relating to a process of change
  42. Difference of Squares- a² – b² = (a + b)(a – b)
  43. Dichotomy- Division into two mutually exclusive groups
  44. Discrete Variable- A variable that can take on a finite or countable number of values
  45. Diagonal Matrix- A matrix with non-zero elements only on the diagonal
  46. Divisibility- The ability of one number to be divided by another without a remainder
  47. Duality Principle- Interchange properties in mathematical proofs
  48. Distribution Property- Property of distributing operations over functions
  49. Differential Calculus- The study of how functions change when their inputs change
  50. Discrete Probability- The probability of outcomes in a discrete sample space
  51. Direct Method- Solving linear equations by directly manipulating them
  52. Disjoint Union- Combination of disjoint sets
  53. Discrete Distribution- Probability distribution for discrete random variables
  54. Division Algorithm- The method of dividing polynomials
  55. Dimensional Analysis- Analysis of units and their consistency
  56. De Morgan’s Laws- Laws relating union and intersection of sets
  57. Discrete Fourier Transform- Transform used in signal processing
  58. Definite Integral- Integral evaluated over a specific interval
  59. Domain of Definition- The set of values for which a function is defined
  60. Deterministic Model- A model where outcomes are precisely determined
  61. Difference Operator- Operator expressing finite differences
  62. Disjunctive Normal Form- Standard form in boolean algebra
  63. Decision Tree- A branching method to reach decisions based on conditions
  64. Differential Geometry- Study of curves and surfaces through calculus
  65. Dimensionality Reduction- Reducing the number of variables under consideration
  66. Distance Formula- Formula to calculate distance between two points
  67. Discrete Event Simulation- Simulation of processes in discrete steps
  68. Discrete Optimization- Optimization problem over discrete spaces
  69. Digest Function- Function that transforms data into fixed-size hash
  70. Degrees of Freedom- The number of values in a calculation that are free to vary
  71. Discrepancy- Difference between expected and actual values
  72. Dynamic Programming- Method for solving complex problems by breaking them down
  73. Doubling Time- Time required for a quantity to double in size
  74. Difference Quotient- The ratio of change in function value to change in variable
  75. Dual Graph- A graph associating polygon vertices and edges to another
  76. Disjoint Partition- A partition where subsets have no elements in common
  77. Divisible- Capable of being divided by another number without remainder
  78. Discrete Logarithm- Logarithm in terms of integers over modular arithmetic
  79. Discrete Set- A set of distinct and separate values
  80. Distributed Processing- Processing spread over multiple systems
  81. Discreteness- Quality of being separate or distinct
  82. Decay Rate- The rate at which a substance decreases over time
  83. Discovery Learning- Learning approach through discovery and exploration
  84. Discrete Cosine Transform- Similar to Fourier transform, used in signal processing
  85. Data Mining- Extracting useful information from large data sets
  86. Design Matrix- A matrix of data for statistical models
  87. Discontinuity- A point where a mathematical function is not continuous
  88. Discrete Sampling- Sampling at distinct intervals
  89. Decision Boundary- Separation in space used in classification problems
  90. Deconvolution- Reversing the effect of convolution on data
  91. Deterministic- Predictable with no randomness involved
  92. Derivative Test- Test using derivatives to find local extrema
  93. Double Counting- Counting an event more than once
  94. Divide- and-Conquer Algorithm – Algorithm breaking problems into smaller subproblems
  95. Damped Oscillation- Oscillation reduced over time due to damping
  96. Data Frame- Structure for storing data in grids
  97. Deadlock- A situation where processes cannot proceed due to dependency
  98. Degree Sequence- Sequence of vertex degrees in a graph
  99. Dichotomous Variable- A variable with only two possible values
  100. Dynamic Range- The ratio between the largest and smallest possible values

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