/ kənˈdʌktə(r); NAmE / noun
1.
a person who stands in front of an orchestra , a group of singers etc., and directs their performance, especially sb who does this as a profession
2.
( BrE also guard ) a person who is in charge of a train and travels with it, but does not drive it
3.
( BrE ) a person whose job is to collect money from passengers on a bus or check their tickets :
a bus conductor
4.
( physics ) a substance that allows electricity or heat to pass along it or through it :
Wood is a poor conductor.
—see also lightning conductor
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WORD ORIGIN
late Middle English (denoting a military leader): via Old French from Latin conductor , from conducere bring together.