# Definition:Order

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## Disambiguation

This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

**Order** may refer to:

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

- Number Theory:
- Multiplicative Order of an Integer: the least positive integer $c$ such that $a^c \equiv 1 \pmod n$.
- Order of a Sociable Chain: the number of members of a sociable chain.

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

- Analysis:
- Order of a Derivative: the number of times a function has been differentiated
- Order of Entire Function a quantity measuring the growth of an entire function
- Exponential Order

- 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

- Approximation Theory:
- Order of Spline: one more than the degree of a spline.