Hellenisation
Noun
Meaning
(British spelling) The adoption of Greek manners and culture
(British spelling) The act of causing a culture to become Greek
(British spelling) The act of Hellenizing, making something Greek or Hellenistic in form or character, (cf. Latinize) such as by coining a word with Greek roots to express a concept that otherwise might be expressed in modern vernacular
Source: en.wiktionary.orgExamples
Antiochus IV Epiphanes succeeded his older brother to the Seleucid throne and immediately adopted his father's previous policy of universal Hellenisation.
Full Hellenisation only took place under Ptolemaic rule.