積極

active / energetic / vigorous / positive (outlook) / proactive

to amass / to accumulate / to store / measured quantity (such as area of volume) / product (the result of multiplication) / to integrate (math.) / to solve (or integrate) an ordinary differential equation (math.) / old / long-standing

extremely / pole (geography, physics) / utmost / top

zeal / initiative / enthusiasm / activity

enthusiast / (political) activist

active response / energetic response

proactive