Definition:Number Prefixes/Half/Semi-

Definition

The prefix semi- denotes half: $\dfrac 1 2$.

Examples

The prefix semi- can be found in the following contexts:

• semicircle: one of the halves of a circle which has been bisected through its diameter by a straight line

• semiprime number: an integer which is the product of two (not necessarily distinct) primes

Also see

• hemi-

Linguistic Note

The prefix semi- derives from the Latin semi-, meaning half.

Sources

• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): semi-