cohort \KOH-hort\, noun:
1. A group or band of people.
2. A companion; an associate.
3. A group of people sharing a common statistical factor (as age or membership in a class) in a demographic study.

The first school in what is now South Sioux City was built around 1857. This school was taught by Mary Pinkerton, and was located just north of Lewis and Clark Elementary.