• 仮説かせつ — hypothesis
• 仮定かてい — assumption
• 仮病けびょう — feigned illness
• 仮面かめん — mask
• 仮名かな — kana (syllabary)
• 仮かり — temporary

仮 pairs the person radical 亻 with phonetic 反, hinting at “opposite” or “not the real thing.” It marks something provisional, assumed, or outwardly present but not final.