Sri Matre Namaha
Nirbhedā – The One Hundred & Seventy Eighth name in Lalitha Sahasranamam.
nirgatah bhedah yasyah sa
She who is without bheda, i.e., difference
She is said to be free from difference (i.e., duality) Siva and Sakti are not different
Possibly this difference could mean the difference between Her and Shiva. That is why, it is said that wise men do not find any difference between Shiva and Shakthi. Their unified form is known as the Brahman, and there is no difference between them. The qualities of this unified form are being described in this sahasranamam. Though all the namas in this Sahasranamam addresses Lalithambigai, it should not construed that they are addressed to Her in Her individual capacity. They are addressed to the Shiva-Shakthi combine.
Soundaya Lahari says that neither Shiva nor Shakthi can act, without depending on the other. Kurma Purana says that the Supreme Shakthi is infinite, devoid of all differences and destroyer of all differences (described in the next nama).