ONZA Meaning of ONZA in English ˈȯnzə, -n(ˌ)sä, -n(ˌ)thä noun( -s )Etymology: Spanish, literally, ounce, from Latin uncia ounce, twelfth part — more at ounce : an old Spanish gold doubloon Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012