Definition:Order


 * Set Theory:
 * Order of Set: Another word for the cardinality of a set.


 * Abstract Algebra:
 * Order of an Algebraic Structure


 * Group Theory:
 * Order of an Element in a Group


 * Matrix Theory and linear algebra:
 * Order of a Matrix: another term for the dimensions of a matrix
 * Order of a Square Matrix
 * Order of a Determinant


 * Number Theory:
 * Multiplicative Order of an Integer: the least positive integer $c$ such that $a^c \equiv 1 \pmod n$.


 * Polynomial Theory:
 * Order of a Polynomial: another term for its degree


 * Calculus:
 * Order of a Derivative: the number of times a function has been differentiated


 * Differential Equations:
 * Order of a Differential Equation: the highest order derivative that appears in that differential equation


 * Graph Theory:
 * Order of a Graph: the number of vertices in a graph

Also see

 * Definition:Finite Order
 * Definition:Infinite Order


 * Definition:Ordering