位相|いそうisou[0]heiban (flat)
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- noun, physicsphase (e.g. wave, electricity, moon)
- noun, mathtopology
- noun, linguisticsregister
- SynonymフェーズNeutralKatakana borrowing of English "phase"; neutral in register, it commonly denotes stages of a plan or project rather than wave or lunar phenomena, where 位相 prevails.
Use 位相 for scientific and mathematical senses—wave, electrical, or lunar phase and topology—where it is the standard term; フェーズ, the katakana loanword with neutral register, suits everyday and business talk about stages.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


