| (subclass SeasonOfYear TimeInterval) | Mid-level-ontology.kif 19130-19130 | Season of year is a subclass of time interval |
| (subclass WinterSeason SeasonOfYear) | Mid-level-ontology.kif 19141-19141 | Winter season is a subclass of season of year |
| (subclass SpringSeason SeasonOfYear) | Mid-level-ontology.kif 19159-19159 | Spring season is a subclass of season of year |
| (subclass SummerSeason SeasonOfYear) | Mid-level-ontology.kif 19179-19179 | Summer season is a subclass of season of year |
| (subclass FallSeason SeasonOfYear) | Mid-level-ontology.kif 19197-19197 | Fall season is a subclass of season of year |
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