adjective
describing something that is capable of acting or operating independently or automatically without external control or assistance
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The self-acting mechanism in the machine ensures smooth operation without the need for manual intervention.
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I love how this self-acting camera adjusts its settings automatically for the best picture.
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This self-acting vacuum cleaner is a game-changer - it cleans the house while I relax!
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His self-acting attitude towards life has helped him overcome many obstacles without seeking external help.