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single-acting (not comparable)

  1. (engineering) Having simplicity of action; especially acting or exerting force during strokes in one direction only; said of a reciprocating engine, pump, etc.

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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for single-acting in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)