Learn how to say Synergistic correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word synergistic:
(of people, groups, or companies) working together in a creative, innovative, and productive manner
ˌsynerˈgistically, ˌsynerˈgetically adverb
C17: from Greek sunergētikos, from syn- + -ergētikos, from ergon work; see energy