意思;意义;含义 The meaning of a word, expression, or gesture is the thing or idea that it refers to or represents and which can be explained using other words.
I hadn't a clue to the meaning of 'activism'...
我根本不明白 activism 的意思。
I became more aware of the symbols and their meanings.
(言语、书、电影等的)含义，主旨，意图 The meaning of what someone says or of something such as a book or film is the thoughts or ideas that are intended to be expressed by it.
Unsure of the meaning of this remark, Ryle chose to remain silent...
Her book is not without autobiographical meaning.
(活动、行为等的)意义，价值 If an activity or action has meaning, it has a purpose and is worthwhile.
Art has real meaning when it helps people to understand themselves.
...a challenge that gives meaning to life.
(由于缺乏经历、资质等)不理解这个词的含义，不知道什么叫… If you mention something and say that someone doesn't know the meaning of the word, you are emphasizing that they have never experienced the thing mentioned or do not have the quality mentioned.
Don't mention failure when Kevin is around. He doesn't know the meaning of the word.