Intimidation is when you try to frighten a weaker person into doing what you want. You might use intimidation to get your brother to mow the lawn for you.
Intimidation can refer to the act of making someone feel timid or afraid — like what you sometimes do to your brother — or it can also refer to that fearful feeling itself. Intimidation might make members of a jury hesitate to convict a defendant. Intimidation can also refer to feeling threatened, discouraged, or afraid because you're facing something stronger or superior. You might feel a sense of intimidation right before your soccer team plays the undefeated state champs.