(bound form) to strengthen; to make firm; to consolidate; to stabilize

the nonmetallic chemical element with symbol N; a colorless, odorless gas that makes up about four-fifths of the earth's atmosphere

the natural purpose or activity of something, such as a biological or chemical process; often used as a suffix to mean "-ation" or "-ing" as in 消化 xiāo​huà plus this word for "digestion"