Meaning of CONDUCTOR in English

con ‧ duc ‧ tor /kənˈdʌktə $ -ər/ BrE AmE noun [countable]

1 . someone who stands in front of a group of musicians or singers and directs their playing or singing

2 . British English someone whose job is to collect payments from passengers on a bus

3 . American English someone who is in charge of a train and collects payments from passengers or checks their tickets SYN guard British English

4 . something that allows electricity or heat to travel along it or through it:

Wood is a poor conductor of heat.

⇨ ↑ lightning conductor

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.