Primary (adjective)

1. Of first importance; main.
2. Occurring or operating at an early stage in a process.
3. Of the first rank in order of time, as a primary source.
4. Of or relating to elementary education, typically for children aged 5 to 11.

Origin:

Late middle english: from latin primarius, from primus "first".

Examples:

1. The primary concern of the company is to maximize profits.
2. The primary colors of light are red, green, and blue.
3. In the primary stages of the disease, symptoms may not be obvious.
4. She is a primary school teacher with over 10 years of experience.
5. The primary goal of the project is to improve the lives of people in the community.