(~s)
1.
A ~ is one of the separate parts of a course taught at a college or university. (BRIT)
These courses cover a twelve-week period and are organised into three four-week ~s.
= unit
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2.
A ~ is a part of a spacecraft which can operate by itself, often away from the rest of the spacecraft.
A rescue plan could be achieved by sending an unmanned ~ to the space station.
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