This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
晸 combines 日 (sun) with 政, but the exact historical development and original meaning are uncertain. It may have been a variant or a character with a now-obscure meaning.
The sun 日 shines over 政 (government), but the meaning is unclear. Perhaps imagine a rare character where sunlight illuminates governance.
For テイ, picture a tea ceremony held under the morning sun: tea -> テイ, with the sun 日 overseeing the formal 政-like arrangement.
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