Learn how to say Illegitimatise correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word illegitimate:
1not authorized by the law; not in accordance with accepted standards or rules:
defending workers against illegitimate managerial practices
2(of a child) born of parents not lawfully married to each other.
a person who is illegitimate by birth.
mid 16th century: from late Latin illegitimus (from in- ‘not’ + legitimus ‘lawful’), suggested by legitimate