'advancedly' originates from the English adjective 'advanced', which is the past participle/adjective form of the verb 'advance'. 'Advance' comes from Old French 'avancer' (also 'avancier'), ultimately from Vulgar Latin/Latin elements meaning 'before' or 'forward'.

'advance' entered Middle English from Old French 'avancier/avancer'; the past participle/adjective 'advanced' was formed in English, and the adverbial form 'advancedly' is derived from that adjective by adding the adverbial suffix '-ly'.

Initially related to physical motion 'to move forward' or 'to put before', the sense shifted toward development and level of progress; 'advancedly' now means 'in a forward/developed manner' or 'to a high degree'.