What does four-stroke engine mean?
• FOUR-STROKE ENGINE (noun) The noun FOUR-STROKE ENGINE has 1 sense: 1. an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke Familiarity information: FOUR-STROKE ENGINE used as a noun is very rare.