Englishfor English speakers
rail
Noun
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A rail is a long and thin piece of metal.
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A rail is a long and thin bar along a stairway or path for people to slide their hand along while they walk.
She put her hand on the railing beside the stairs so she wouldn't fall.
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A rail is a surface where trains run on.
The railway stretches across the country.
conditioning
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noun
a learning process in which an organism's behavior becomes dependent on the occurrence of a stimulus in its environment
unit
Noun
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One of a measure of something; the amount of something that is counted as "one".
Measure five units to the left.
$4 is the unit price.
A pound is a useful unit for thinking about amounts of butter.
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Form of measurement.
I prefer metric units.
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Item, used when no other word for something exists.
He set up the A/C unit.