The word 'serendipitously-backed' is a modern compound, formed from 'serendipitously' (adverb form of 'serendipity', meaning by chance in a happy way) and 'backed' (past participle of 'back', meaning supported).

'Serendipitously' comes from 'serendipity', coined in the 18th century, and 'backed' from the verb 'back', meaning to support. The compound 'serendipitously-backed' is a recent formation in English, used to describe support that occurs by fortunate chance.

Initially, the components meant 'by chance' and 'supported', and together now mean 'supported by fortunate chance'.