Tusita heaven is said to be the celestial realm where Maitreya Bodhisattva resides.
六欲天 is the broader category of the six heavens of the desire realm, of which 兜率天 is the fourth.
Standard kanji spelling for this Buddhist term.
Variant kanji spelling, less common.
Variant kanji spelling, less common.
From the Sanskrit 'Tuṣita', meaning 'contentment' or 'satisfaction', via Chinese Buddhist texts.