To increase is to become greater or more in number, amount, size, or in some other way, as in Our profits will increase as demand increases. ... It can also refer to the amount by which something has increased, as in The increase was $5,000 per year.

Does Increase Mean Higher?

The noun increase indicates growth of something that gets bigger in number or volume. When used as a verb, it means the act of growing or gaining more. However it's used, it refers to something that has gotten bigger.

Does decrease mean more or less?

Decrease, diminish, dwindle, shrink imply becoming smaller or less in amount. Decrease commonly implies a sustained reduction in stages, especially of bulk, size, volume, or quantity, often from some imperceptible cause or inherent process: The swelling decreased daily.