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Mimosa (cocktail) For other uses, see Mimosa (disambiguation). A Mimosa is a cocktail composed of equal parts champagne (or other sparkling wine) and chilled citrus juice, usually orange juice unless otherwise specified (e.g., a grapefruit juice mimosa). It is traditionally served in a tall champagne flute at brunch, at weddings, or as part of First Class service on some passenger railways and airlines.
2. any of various tropical shrubs or trees of the genus Mimosa having usually yellow flowers and compound leaves. 3. a mixed drink containing champagne and orange juice. Familiarity information: MIMOSA used as a noun is uncommon.. any of various tropical shrubs or trees of the genus Mimosa having usually yellow flowers and compound leaves. 3. a mixed drink containing champagne and orange juice. Familiarity information: MIMOSA used as a noun is uncommon.