上代 じょうだい特殊 とくしゅ仮名遣 かなずかいだろう
jōdaitokushukana zukaidarō

Noun
Da Copula

Expresses probability ("probably…") of 上代特殊仮名遣い

1. Probably archaic kana usage.; Likely old kana orthography.

Presumptive
Conjecture
Linguistics