Definition of furthermore adverb from the Oxford Advanced Learner's Dictionary

  

furthermore

 adverb
adverb
BrE BrE//ˌfɜːðəˈmɔː(r)//
 
; NAmE NAmE//ˌfɜːrðərˈmɔːr//
 
(formal)
 
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in addition to what has just been stated. Furthermore is used especially to add a point to an argument. synonym moreover He said he had not discussed the matter with her. Furthermore, he had not even contacted her. Language BankadditionAdding another item Bilingual children do better in IQ tests than children who speak only one language. In addition/What is more, they seem to find it easier to learn third or even fourth languages. Learning another language not only improves children’s job prospects in later life, but also boosts their self-esteem. Teaching children a second language improves their job prospects in later life. Other benefits include increased self-esteem and greater tolerance of other cultures. Another/One further/One additional reason for encouraging bilingual education is that it boosts children’s self-esteem. Studies suggest that bilingual children find it easier to learn additional languages. There is, moreover, increasing evidence that bilingual children perform better across a range of school subjects, not just foreign languages. His claim that children find bilingual education confusing is based on very little evidence. Moreover, the evidence he does provide is seriously flawed. Research has shown that first-language development is not impeded by exposure to a second language. Furthermore, there is no evidence to support the claim that children find bilingual education confusing.
See the Oxford Advanced American Dictionary entry: furthermore