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Formerly it referred to the entire frontal part of the abdomen, as in a bird's breast; referring to "breasts" was once incorrect usage, but is now standard.
'''Breasts''' are the frontal part of the upper human abdomen that, in women, includes the [[mammary glands]].
The ''breast''' can refer to the frontal part of the upper human abdomen that, in women, includes the [[mammary glands]], or to either of these glands individually.
The disproportionately large size of human breasts, compared to those of other [[mammal]]s, has given rise to speculation that they serve a signalling function, both of their owner's maturity and of her sexual availability and readiness.
The disproportionately large size of human breasts, compared to those of other [[mammal]]s, has given rise to speculation that they serve a signalling function, both of their owner's maturity and of her sexual availability and readiness.