simplicity noun
ADJ. extreme, great | relative | apparent Don't be fooled by the music's apparent simplicity.
VERB + SIMPLICITY have
PREP. for ~ For simplicity, I shall continue to use the general word ‘river’.
PHRASES be simplicity itself (= to be very simple) His solution to the problem was simplicity itself. | for the sake of simplicity
You can also check other dicts: simplicity (English, 中文解释 ), wordnet sense, Collins Definition