Parthenogenesis

The artificial activation of an egg in the absence of a sperm; the egg begins to divide as if it has been fertilized.

Source: Stem Cell Information, NIH, USDHHS

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Part Time Employment

Employment involving less than the standard or customary working time.

Part Per Trillion

A unit of proportion equal to 10E-12.

Part per Thousand

A unit of proportion equal to 10E-3.

Part per Million per Volume

A unit of proportion equal to 10E-6 per volumic unit.

Part Per Million

A unit of proportion equal to 10E-6.

Part Per Billion

A unit of proportion equal to 10E-9.