anticipatory
/ænˈtɪsɪpeɪtərɪ/adjective
1- happening, performed, or felt in anticipation of something事情尚未发生前就发生（或完成、感觉到）的：
an anticipatory flash of excitement.
事情还未发生就突如其来的一阵激动。
1.1
- Law (of a breach of contract) taking the form of an announcement or indication that a contract will not be honoured【律】宣称（或有迹象表示）不愿遵守合约的。
1.2
- Grammar denoting the use of 'it' as a dummy subject or object, anticipating the true subject or object, which comes later in the sentence (as in it is easy to please John)【语法】先行的。