Mode means one of the following:
(1) A distinct combination of engine speed and load for steady-state testing.
(2) A continuous combination of speeds and loads specifying a transition during a ramped-modal test.
(3) A distinct operator demand setting, such as would occur when testing locomotives or constant-speed engines.
40 CFR § 1065.1001
The definitions in this section apply to this part. The definitions apply to all subparts unless we note otherwise. All undefined terms have the meaning the Act gives them. The definitions follow: