The phrase “tertiary” is an adjective meaning “of third significance or rank”. It’s typically used to explain one thing that’s much less necessary than two different issues. For instance, you may say that your “tertiary” objective is to learn to play the guitar. Because of this studying the guitar is much less necessary to you than two different objectives, equivalent to ending faculty and getting a job.
The phrase “tertiary” may also be used to explain one thing that’s third in a collection. For instance, you may say that the “tertiary” stage of a undertaking is the testing section. Because of this the testing section is the third stage of the undertaking, after the planning and growth levels.
