1. The number midway between the two middle numbers in a series containing an even or odd number of items Noun
2. Relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values) Adjective Satellite
3. Dividing an animal into right and left halves Adjective Satellite
4. Relating to or situated in or extending toward the middle Adjective Satellite