| old | (adjective) of long duration; not new | - |
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| (adjective) (used especially of persons) having lived for a relatively long time or attained a specific age | - |
| (adjective) skilled through long experience | Synonyms: older |
| (adjective) (used for emphasis) very familiar | - |
| (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, smashing, swell |
| (adjective) just preceding something else in time or order | Synonyms: previous |
| (adjective) belonging to some prior time | Synonyms: erstwhile, former, one-time, onetime, quondam, sometime |
| (noun) past times | - |
| olden | (adjective) relating to time long past | - |
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| older | (adjective) skilled through long experience | Synonyms: old |
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| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, senior |
| (adjective) used of the older of two persons of the same name especially used to distinguish a father from his son | Synonyms: elder, sr. |
| oldie | (noun) a song that was formerly popular | Synonyms: golden oldie |
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| oldish | (adjective) somewhat elderly | - |
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| oldline | (adjective) long-established | Synonyms: old-line |
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| (adjective) adhering to conservative or reactionary principles | Synonyms: old-line |
| oldness | (noun) the quality of being old; the opposite of newness | - |
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| (noun) the opposite of youngness | - |
| oldster | (noun) an elderly person | Synonyms: golden ager, old person, senior citizen |
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| oldtimer | (noun) an elderly man | Synonyms: antique, gaffer, old-timer, old geezer |
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| (noun) an experienced person who has been through many battles; someone who has given long service | Synonyms: old-timer, old hand, old stager, stager, veteran, warhorse |
| oldwench | (noun) tropical Atlantic fish | Synonyms: Balistes vetula, Bessy cerca, oldwife, queen triggerfish |
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| oldwife | (noun) tropical Atlantic fish | Synonyms: Balistes vetula, Bessy cerca, oldwench, queen triggerfish |
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| (noun) a common long-tailed sea duck of the northern parts of the United States | Synonyms: Clangula hyemalis, old squaw |