takes genitive case の, adjectival noun or quasi-adjective

  1. identical, same, one and the same, equal.
  2. fair, equal treatment, without discrimination.

Variations

Pronunciation Kanji Kana Is Common
同一 どういつ

Contained Kanji Breakdown

same, agree, equal
ドウ おな.じ (2nd, N4)
upside-down box radical (no. 13)
キョウ ケイ (Kentei 1)
delicious(旨) variant
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
mouth
くち コウ ク (1st, N4)
one, one radical (no.1)
イチ いっ ひと- (1st, N5)