The American Heritage® Dictionary of the English Language, 4th Edition
adj. Synchronous.
adj. Of or relating to the study of phenomena, such as linguistic features, or of events of a particular time, without reference to their historical context.
adj. relating to the study of a language at only one point in its history.
The Century Dictionary and Cyclopedia
Same as synchronical.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. concerned with phenomena (especially language) at a particular period without considering historical antecedents
adj. occurring or existing at the same time or having the same period or phase
adj. (of taxa) occurring in the same period of geological time
Word Usage
"That is, the events of the poem, hardly events at all in synchronic readings, do not share any sort of cause-effect relationship and do not cohere into any sort of continuous, temporal structure."