Englishfor English speakers
mean
Verb
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A word means something when the word expresses the same idea as the other something.
Slay means kill. Both of them mean to make dead.
mean
Adjective
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When you are a mean person, you are not nice.
The boys who hit you were very mean.
mean
Noun
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The mean is a measure of the average of a list of numbers. The sum total of the numbers divided by how many numbers in the list.
The mean of the numbers 2,3,4 is 3. (2+3+4)/3 = 9/3 = 3.
energy
Noun
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Energy is the ability to do work: move, give off heat, give off light, etc.
Unlike coal or oil, atomic energy production creates little air pollution.
Higher electricity prices should help promote energy efficiency.
The amount of energy in 100g or 100ml of food is much higher for foods with a lot of sugar.
She's all full of energy and she can't sit still.
This problem has taken up most of her time and energy for over a year.