in·ter·fsce [n. in-ter-feys; v. in-ter-feys, in-ter-feys]

–noun

1. a surface regarded as the common boundary of two bodies, spaces, or phases

2. a common boundary or interconnection between systems, equipment, concepts, or human beings.

3. communication or interaction

4. a thing or circumstance that enables separate and sometimes incompatible elements to coordinate effectively

–verb (used with object)

5. to bring into an interface

6. to bring together; connect or mesh

–verb (used without object)

7. to function as an interface

8. to meet or communicate directly; interact, coordinate, synchronize, or harmonize (often fol. by with)