source: Democratic Debate GIF by GIPHY News - Find & Share on GIPHY

1. (of an argument, theory, or policy) logical and consistent:

〖通例名詞の前で〗首尾一貫した, 筋の通った, 統一の取れた〈計画･文章･概念など〉

e.g. they failed to develop a coherent economic strategy.

(of a person) able to speak clearly and logically:

〖通例be ～〗 〈人が〉明瞭に［しっかりとした口調で］話ができて

e.g. she was lucid and coherent and did not appear to be injured.

2. united as or forming a whole:

互いに密着した, 凝集した

e.g. divided into a number of geographically coherent kingdoms.

3. Physics (of waves) having a constant phase relationship.

〘物理〙 (可)干渉性の

mid 16th century (in the sense ‘logically related to’): from Latin cohaerent- ‘sticking together’, from the verb cohaerere (see cohere).