1. Adverb (fukushi), Noun which may take the genitive case particle 'no'

   originally; from the start; from the beginning; from the outset; by nature

   Usually written using kana alone

   彼らは元々あった文明を破壊した。

2. Na-adjective (keiyodoshi), Noun

   none the worse (for); (coming out) even; in the same position (as before)

   Usually written using kana aloneusu. as 〜て(も)もともと, 〜でもともと, etc.

Also written 元元【もともと】motomoto、本本【もともと】motomoto、本々【もともと】motomoto