Acting in or impelled from one direction only, as an engine; not reciprocating.
Webster's New World
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Single-acting Sentence Examples
A single-acting, piston-type cylinder uses fluid pressure to apply force in one direction.
If you mixed two parts of cream of tartar to one art of baking soda, you would have a rudimentary single acting baking powder.
Double acting baking powders will have additional acids added that will react with heat and add rise to your product as it cooks while single acting adds all its rise before cooking.