Search Result for "proactive": 
Wordnet 3.0

ADJECTIVE (2)

1. descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently;
- Example: "proactive inhibition"
- Example: "proactive interference"

2. (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens; 



WordNet (r) 3.0 (2006):

proactive
    adj 1: descriptive of any event or stimulus or process that has
           an effect on events or stimuli or processes that occur
           subsequently; "proactive inhibition"; "proactive
           interference" [ant: retroactive]
    2: (of a policy or person or action) controlling a situation by
       causing something to happen rather than waiting to respond to
       it after it happens