What does solidarity mean its for ap euro history summer hw i cant find it anywh

Question: What does solidarity mean its for ap euro history summer hw i cant find it anywhere!?
Best Answer - Chosen by Asker:

If it is related to contemporary European History you may look at "Solidarnosc" (Solidarity) a trade union and political movement established in 1980 in Poland and initially led by Lech Walesa (is the first non communist trade union in a communist country)
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