Other forms: purported, purporting, purports
To purport is to claim to be something, perhaps falsely. Purports to be official, a purported letter, purported to show.
The doubt is built in, which is why journalists and lawyers use it constantly about documents. As a noun with the stress moved forward, the purport of something is its general meaning.
1verbpurportTo claim to be something, perhaps falsely.
“The email purports to come from your bank, but it's a scam.”
purport is a claiming.
Anglo-Norman purporter means to convey or contain, from Latin pro plus portare, to carry.
Old French
porter — carry
Latin
pro — forth
Anglo-Norman
purporter
Middle English
purporten
English, today
purport
From Middle English purporten, from Anglo-Norman purporter and Old French porporter (“convey, contain, carry”), from pur-, from Latin pro (“forth”) + Old French porter (“carry”), from Latin portō (“carry”).
Etymology from Wiktionary, CC BY-SA