Definition of trade-unionism:
(n) :
(uncountable) The buying and selling of goods and services on a market.
(n) :
(countable) A particular instance of buying or selling.
(n) :
(countable) An instance of bartering items in exchange for one another.
(n) :
(countable) Those who perform a particular kind of skilled work.
(n) :
(countable) Those engaged in an industry or group of related industries.
(n) :
(countable) The skilled practice of a practical occupation.