A more thorough explanation:

Definition: To refuse to notice, recognize, or consider. (Of a grand jury) to reject (an indictment) as groundless; to no-bill (a charge).

• When my little brother is annoying me, I try to ignore him so he will stop bothering me.
• The teacher told the students to ignore their phones during class.
• The grand jury decided to ignore the charges against the defendant because there was not enough evidence to support them.

The examples illustrate the definition of ignore by showing situations where someone is intentionally not paying attention to something or someone. In the first example, the speaker is ignoring their little brother to avoid being bothered. In the second example, the teacher is telling the students to ignore their phones to focus on the lesson. In the third example, the grand jury is ignoring the charges against the defendant because they do not believe there is enough evidence to support them.