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1.epidemic(a.): characterized by very widespread growth or extent
ex :The little girl's giggles were epidemic, and soon the entire gathering was laughing.
2.vitamin(n.):a healthy substance in food
ex :This cereal contains essential vitamins and minerals.
3.virus(n.): the causative agent of an infectious disease
ex :Is the illness caused by bacteria or a virus?
4.malicious(n.): having or showing a desire to cause harm to someone :given to, marked by, or arising from malice
ex :A malicious distortion of the truth.
5.expel(v.): to force to leave (as a place or organization) by official action
ex :The club may expel members who do not follow the rules.
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