Englishfor English speakers
amplifier
Noun
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An amplifier is an electronic device that increases the strength of a sound or signal.
You need to plug in the amplifier to get any sound.
ratio
Noun
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A ratio is the comparison in size or number between two things. It is written mathx:y/math and read mathx/math to mathy/math. It is the same as the fraction math\frac {x} {y}/math.
The ratio of men's jobs to women's is 8 to 1.
But Germany now has one of the highest ratios of spending to GDP in the European Community.
The low student/teacher ratio makes this a great school.