The Collaborative International Dictionary
Single-acting
Single-acting \Sin"gle-act`ing\, a. Having simplicity of action; especially (Mach.), acting or exerting force during strokes in one direction only; -- said of a reciprocating engine, pump, etc.
Wiktionary
single-acting
a. (context engineering English) Having simplicity of action; especially acting or exerting force during strokes in one direction only; said of a reciprocating engine, pump, etc.