"Special kana usage of ancient times": distinctions in the usage of man'yōgana in early Old Japanese works that were quickly lost.

understanding, comprehension / appreciation

Alternative spelling of 上代特殊仮名遣

to study / to learn

ancient times / (nominal) retail price

the above / the top (position or direction) / the surface of / superior in skill, age, level, etc.

in addition; furthermore / on top of (which)

understand, comprehend / appreciate

important, significant

importance, consequence, significance