Englishfor English speakers
phase
Noun
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A phase is stage in a process.
We will look at very basic ideas during the first phase of training.
As the war enters its final phase, the role of the UN will probably become more important.
Teenagers often go through a phase of being attracted to someone of the same sex.
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If things are in phase, they are working, moving, or changing together.
phase
Verb
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If you phase something in, you introduce it step by step.
Over the next few years, all farm support was slowly phased out.
spectrum
Noun
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A range.
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The pattern of absorption or emission of radiation that is made by a substance when it is put in contact with an energy such as radiation, heat, electricity, etc.
density
Noun
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Density is how much stuff fits in a particular area.
The population density of Singapore is one of the highest in the world.
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The density of a material is how closely packed its atoms are.
The density of water is higher than the density of steam.