| senile | (adjective) mentally or physically infirm with age | Synonyms: doddering, doddery, gaga |
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| senility | (noun) the state of being senile | - |
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| (noun) mental infirmity as a consequence of old age; sometimes shown by foolish infatuations | Synonyms: dotage, second childhood |
| senior | (adjective) older; higher in rank; longer in length of tenure or service | - |
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| (adjective) used of the fourth and final year in United States high school or college | Synonyms: fourth-year |
| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, older |
| (noun) an undergraduate student during the year preceding graduation | - |
| (noun) a person who is older than you are | Synonyms: elder |
| senioritis | (noun) tiredness with the final year of high school | - |
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| seniority | (noun) the property of being long-lived | Synonyms: longevity |
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| (noun) higher rank than that of others especially by reason of longer service | Synonyms: higher rank, higher status, senior status |
| seniti | (noun) 100 seniti equal 1 pa'anga in Tonga | - |
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