An accordance is an act of giving rights to a person or group. The accordance of the right to vote for women was a big milestone in our country's history.
Accordance comes from the Old French acorder, meaning "bring to an agreement." When two things are in accordance, they fit together harmoniously. You'll usually see accordance in the phrase "in accordance with," as when you command your kid brother, "act in accordance with my wishes, or face the consequences!" It's most often used to show that someone is following rules or regulations.