| Epoch(epoch) | | date_of_reference, epoch |
| appearance as argument number 1 |
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| (documentation Epoch EnglishLanguage "An instant in time that is arbitrarily selected as a point of reference.") | QoSontology.kif 2136-2137 | |
| (subclass Epoch TimePoint) | QoSontology.kif 2135-2135 | Epoch is a subclass of time point |
| appearance as argument number 2 |
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| (instance UnixEpoch Epoch) | QoSontology.kif 2139-2139 | Unix epoch is an instance of epoch |
| (termFormat ChineseLanguage Epoch "时代") | domainEnglishFormat.kif 22324-22324 | Unix epoch is an instance of epoch |
| (termFormat ChineseTraditionalLanguage Epoch "時代") | domainEnglishFormat.kif 22323-22323 | Unix epoch is an instance of epoch |
| (termFormat EnglishLanguage Epoch "epoch") | domainEnglishFormat.kif 22322-22322 | Unix epoch is an instance of epoch |
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