noun
plural -tions
[noncount] :the act of taking away something (such as an amount of money) from a total
[count] :something (such as an amount of money) that is or can be subtracted from a total
[noncount] :the act or process of using logic or reason to form a conclusion or opinion about something :the act or process of deducing something
[count] :a conclusion or opinion that is based on logic or reason