In the Linnaean artificial system: the twenty-first class of plants, comprising those which have the stamens and pistils (male and female organs) in separate flowers on the same plant.
Mid 18th century; earliest use found in Chambers's Cyclopaedia. From scientific Latin Monoecia, former class name (LinnaeusSystema Naturae) from ancient Greek μονο- + οἶκος house + scientific Latin -ia. Compare later use of monoicus as a specific epithet. Compare French monoecie.