Pronunciation: (kum-par'u-tur, kom'pu-rā"-), [key]
1. any of various instruments for making comparisons, as of lengths or distances, tints of colors, etc.
2. Electronics.a circuit for comparing two signals, as readings of duplicate information stored in a digital computer, and for giving an indication of agreement or disagreement between them.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.