Compression-ignition means relating to a type of reciprocating, internal-combustion engine that is not a spark-ignition engine. Note that 1036.1 also deems gas turbine engines and other engines to be compression-ignition engines.
40 CFR § 1036.801
The following definitions apply to this part. The definitions apply to all subparts unless we note otherwise. All undefined terms have the meaning the Act gives to them. The definitions follow: