WordNet sense 1 (shrub or small tree having flattened globose fruit with very sweet aromatic pulp and thin yellow-orange to flame-orange rind that is loose and easily removed; native to southeastern Asia):

Citrus reticulata, mandarin orange tree, mandarin orange

WordNet sense 2 (the dialect of Chinese spoken in Beijing and adopted as the official language for all of China):

Beijing dialect, Mandarin Chinese, Mandarin dialect