Englishfor English speakers
laser
Noun
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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The term laser originated as an acronym for "light amplification by stimulated emission of radiation".
combination
Noun
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A combination is an item or group made of different things or kinds of things.
Any combination of these factors increases the risk dramatically.
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Combination is the process of putting two or more things together.
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math{C}_{n}^{m}/math
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.
system
Noun
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A group of things that work together; a way of doing something.
This coloured paper is part of my system for keeping lists of people.