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


[fawr-sahy-kuh l, fohr-] /ˈfɔrˌsaɪ kəl, ˈfoʊr-/
noting or pertaining to an internal-combustion engine in which a complete cycle in each cylinder requires four strokes, one to draw in air or an air-fuel mixture, one to compress it, one to ignite it and do work, and one to scavenge the cylinder.
Also, four-stroke.
Compare two-cycle.
Origin of four-cycle
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for four-cycle
  • The engine shall be four-cycle diesel of the manufacturer's standard design with proven reliability in service.
  • Currently, the snowmobiles use four-cycle engines that produce far less pollution than the two-cycle engines that were once used.
British Dictionary definitions for four-cycle


(US & Canadian) relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion Equivalent term (in Britain and certain other countries) four-stroke Compare two-stroke
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
Cite This Source

Word of the Day

Difficulty index for four-cycle

Few English speakers likely know this word

Word Value for four

Scrabble Words With Friends

Quotes with four-cycle