IPA: /pjuːˈteɪtɪvli/
KK: /pjuːˈteɪtɪvli/
In a way that is generally believed or assumed to be true, but not necessarily proven.
The putatively lost manuscript was discovered in an old library.
Putatively → It is formed from "putare" (meaning to think or consider) and the suffix "-ively" (meaning in a manner of). The word "putatively" means in a manner that is thought or considered to be true, often without definitive proof.
Think of 'putare' meaning to 'think' — so when something is putative, it is something that is considered or thought to be true.