Dictionary.com
definitions

aromaticity

[ar-uh-muh-tis-i-tee, uh-roh-muh-]
noun
  1. the quality or state of being aromatic.
  2. Chemistry. the property of being or resembling any of the aromatic compounds.

Origin of aromaticity

aromatic + -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for aromaticity

aromaticity

noun
  1. the property of certain planar cyclic conjugated molecules, esp benzene, of behaving like unsaturated molecules and undergoing substitution reactions rather than addition as a result of delocalization of electrons in the ring
  2. the quality or state of having an aroma
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012