the GNU version of the Collaborative International Dictionary of English
n. Mutual action or influence; interaction.
The Century Dictionary and Cyclopedia
n. Reciprocal action or influence; interchange of action and reaction, as between the parts of a machine; concurrent operation or procedure; interaction.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. reciprocal action and reaction
Word Usage
""I'm interested to find out what the interplay is between them," Mr. Saluti said, declining to comment on whether Mr. Welch was at the party."