1) Antecedent 2) Eager 3) Prevenient 4) Preventative 1) Antecedent 2) In anticipation 3) Preceding 4) Prevenient 
• (a.) Forecasting; of the nature of anticipation.
An·tic'i·pa·to·ry adjective Forecasting; of the nature of anticipation. Owen. « Here is an anticipatory glance of what was to be. J. C. Shairp. » 
[adj] - in anticipation
anticipatory 1. Experienced or done in the expectation of a future event. 2. Forecasting; of the nature of anticipation.
prevenient adjective in anticipation
of, showing, or expressing anticipation.