| pension | (noun) a regular payment to a person that is intended to allow them to subsist without working | - |
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| pensionary | (noun) a person who works only for money | Synonyms: hireling |
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| (noun) the beneficiary of a pension fund | Synonyms: pensioner |
| pensioner | (noun) the beneficiary of a pension fund | Synonyms: pensionary |
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| pensiveness | (noun) deep serious thoughtfulness | Synonyms: contemplativeness, meditativeness |
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| (noun) persistent morbid meditation on a problem | Synonyms: brooding |
| penstock | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: sluice, sluiceway |
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| (noun) regulator consisting of a valve or gate that controls the rate of water flow through a sluice | Synonyms: floodgate, head gate, sluice valve, sluicegate, water gate |