In Hinduism, Shakti (Devanagari: ; from Sanskrit shak, "to be able"), also spelt as Sakthi or Shakthi, meaning "power" or "empowerment," is the primordial cosmic energy and represents the dynamic forces that are thought to move through the entire universe. Shakti is the concept, or personification, of divine feminine creative power, sometimes referred to as 'The Great Divine Mother' in Hinduism. As the mother she is known as Adi Parashakti or Adishakti. In her avatar as Akshara Mandhapati, her power is her uncontrollable energy. On the earthly plane, Shakti most actively manifests through female embodiment and creativity/fertility, though it is also present in males in its potential, unmanifest form.
Dictionary source: WordNet 2.0
English to English translation of Shakti
Literally, "power." Usually, the worship of the goddesses, who all represent some form of power. Parvati represents the power of sensual and sexual attraction and love. Umma represents the powers that surround birth (the creation of life) and motherhood. Some goddesses represent violent power as well. Durga is a demon-slayer and often symbolizes retribution and justice. Kali is also a demon-slayer, but whereas Durga's power is controlled, Kali is strongest when her power is out of control. The active shakti power is often illustrated in symbolic in union with the passive male power. Thus Parvati is often shown having intercourse with Shiva and Kali is shown triumphant standing on a prone Shiva.