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Definition of softener noun from the Oxford Advanced Learner's Dictionary

softener

noun
 
/ˈsɒfnə(r)/
 
/ˈsɔːfnər/
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  1. [countable] a device that is used with chemicals to make hard water soft
    • a water softener
  2. [uncountable, countable] a substance that you add when washing clothes to make them feel soft
See softener in the Oxford Advanced American Dictionary

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