Collins Chinese Dictionary Plus (3rd edition), 2011:
definition [dɛfɪˈnɪʃən]
n
1
[c]
[of word] 定义(義) dìngyì [个 gè]
2
[u]
(=clarity)
[of thought, expression] 明确(確)性 míngquèxìng
[of thought, expression] 明确(確)性 míngquèxìng
3
[u]
[of photograph, features] 清晰度 qīngxīdù
- by definition
就本身而言 jiù běnshēn ér yán