| antenatal | (adjective) occurring or existing before birth | Synonyms: antepartum, prenatal |
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| appurtenant | (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, ancillary, auxiliary |
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| bicentenary | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentennial |
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| centenarian | (adjective) being at least 100 years old | - |
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| centenary | (adjective) of or relating to or completing a period of 100 years | Synonyms: centennial |
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| quincentenary | (adjective) of or relating to a 500th anniversary | Synonyms: quincentennial |
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| semicentenary | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentennial |
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| tenable | (adjective) based on sound reasoning or evidence | Synonyms: well-founded |
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| tenacious | (adjective) good at remembering | Synonyms: long, recollective, retentive |
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| (adjective) sticking together | Synonyms: coherent |
| (adjective) stubbornly unyielding | Synonyms: dogged, dour, persistent, pertinacious, unyielding |
| tenanted | (adjective) resided in; having tenants | Synonyms: occupied |
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| tricentenary | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentennial |
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| untenable | (adjective) (of theories etc) incapable of being defended or justified | Synonyms: indefensible |
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| untenanted | (adjective) not leased to or occupied by a tenant | Synonyms: unoccupied |
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