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| Subject | English | Japanese |
| obs. | n vs crowning a boy with a traditional cap for the first time at a coming-of-age ceremony | 加冠 |
| gen. | n estimated time of arrival | ＥＴＡ |
| gen. | n estimated time of departure | ＥＴＤ |
| gen. | exp n flux of time | 時の流れ |
| gen. | n time of year when television and radio replace programs | 改編期 (usu. spring and fall) |