1. 重要的，重大的，可观的　important; considerable
2. 有意义的　having a meaning, especially one that is immediately obvious
3. 意味深长的　full of meaning

　～ for〔to〕　对…重要的

　This is a significant contribution to knowledge.　这是对知识的重大贡献。
　He gave her a significant look.　他意味深长地看了她一眼。
　I don't think that is significant.　我认为那没有什么用意。
　Your success today may be significant for your whole future.　你今天的成功对你的整个未来可能是重要的。
　A smile is significant of pleasure.　微笑表示满意。
　It is significant that our ambassador was not invited.　重要的是我们的大使没有被邀请。

 ♣ significant, important, vital
　这组词都可表示“重要的”。significant指某事特别有意义，尤其突出、为人所记忆或长远看很有贡献，但不一定有紧迫的或强有力的含意；important既可指某事意味深长，也可指有一点价值的；vital指对整体的安宁或成功能起到重大的、不可缺少的作用。

　［派生词］ significantly adv.重要地
　［同义词］ chief, great, important, main, major
　［反义词］ unimportant