- decrease, decrement - the amount by which something decreases
--1 is a kind of amount
--1 has particulars: drop, dip, fall, free fall; shrinkage - decrease, decrement - a process of becoming smaller or shorter
--2 is a kind of process
Antonyms: increase, increment, growth
--2 has particulars:decay, decline; decline, diminution; desensitization, desensitisation; narrowing; slippage; wastage