Sri Devi refers to Shakti, the Divine Mother. Khadga means Sword, Mala means Garland, Stotram means a hymn or song of praise. So the Khadgamala Stotram (hereafter, KS) is a hymn to the Divine Mother, which is said to bestow a garland of swords upon those who recite it. The KS takes us mentally through the Sri Chakra; i.e. the mystical geometric representation of the Supreme Goddess. 

This Yantra consists of nine enclosures – each more secret and esoteric than the one before – surrounding a central point, or bindu, in which Devi, the Supreme Goddess (here in Her erotic form as Kameshwari) is joined in coitus with her consort. As we make our way to the center of Sri Chakra, we pay homage to the 98 yoginis or aspects of Devi (by reciting each of their names) who guard the various “power points” of the charka along the way. We internalize each yogini to become Her; and this prepares us to meet the next yogini on our path – and so on until we reach the center. 

'SHAKTI' (Devi) is the Sanskrit word denoting power, or energy – all Energy, whether we perceive it (from our perspective) as positive or negative. (It is the Shakta belief that there is no “positive” or negative energy. Energy is always the Creatrix.) Einstein said that all matter is energy.
Shaktism says all energy – that is, everything in and of the three worlds – is all DEVI.