'Presumptively' definitions:

Definition of 'presumptively'

(from WordNet)
adverb
By reasonable assumption; "presumably, he missed the train" [syn: presumably, presumptively]

Definition of 'Presumptively'

From: GCIDE
  • Presumptively \Pre*sump"tive*ly\, adv. By presumption, or supposition grounded or probability; presumably. [1913 Webster]