Englishfor English speakers
dilation
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noun
the act of expanding an aperture
the dilation of the pupil of the eye
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noun
a lengthy discussion (spoken or written) on a particular topic
operator
Noun
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An operator is a person who operates something.
Jo is the operator of the tractor.
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An operator is a person who works on making connections for people over the telephone.
The operator was struggling to keep the line connected.