What do a.m. and p.m. stand for?


[sing-kruh-niz-uh m] /ˈsɪŋ krəˌnɪz əm/
coincidence in time; contemporaneousness; simultaneousness.
the arrangement or treatment of synchronous things or events in conjunction, as in a history.
a tabular arrangement of historical events or personages, grouped according to their dates.
Physics, Electricity. the state of being synchronous.
Psychoanalysis. the simultaneous occurrence of causally unrelated events and the belief that the simultaneity has meaning beyond mere coincidence.
Also, synchronicity [sing-kruh-nis-i-tee] /ˌsɪŋ krəˈnɪs ɪ ti/ (Show IPA), (for defs 1, 4, 5)
Origin of synchronism
1580-90; < Medieval Latin synchronismus < Greek synchronismós, equivalent to sýnchron(os) synchronous + -ismos -ism
Related forms
synchronistic, synchronistical, adjective
synchronistically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for synchronism
  • Normally they swing out of synchronism in a chaotic way, and the system is stable.
  • The pilot wire system runs through manholes between the fourteen locations to keep the converters in synchronism.
  • Means shall be provided for applying the rearmost trailer brakes in approximate synchronism with the brakes on the towing vehicle.
  • However, two businesses probably would not invest in synchronism, for many reasons.
British Dictionary definitions for synchronism


the quality or condition of being synchronous
a chronological usually tabular list of historical persons and events, arranged to show parallel or synchronous occurrence
the representation in a work of art of one or more incidents that occurred at separate times
Word Origin
C16: from Greek sunkhronismos; see synchronous, -ism
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
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Word Origin and History for synchronism

1580s, "quality of being synchronous," from Modern Latin synchronismus, from Greek synchronismos, from synchronos (see synchronous). Meaning "recurring at the same successive instants of time" is from 1854.

Online Etymology Dictionary, © 2010 Douglas Harper
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synchronism in Medicine

synchronism syn·chro·nism (sĭng'krə-nĭz'əm, sĭn'-)
Coincidence in time; simultaneousness. Also called synchronia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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