It is a legal term relating to a document; and it means "done out posh"! `In other words, an engrossed document is one that is produced in a formal and attractive way. It may be on special pae, or even on Vellum; and it may have some of the characteristics of a medieval manuscript. It my be a deed, and may have ribbons and seals (although seals have not been required by English law for some twenty years).
,
She was so engrossed in her book that she did not notice the time.
It means involved in, as in "Engrossed in thought."
To be engrossed or held (the attention, for example)
She was engrossed in the movie.
Most industrious, most active, most diligent, most engrossed...
of Engross
Absorption is a word used to describe when something absorbs into another thing. It also can mean to be engrossed in something.
Engrossed is the past tense and past participle of the verb engross. It can also be used as an adjective.
of Engross
"He was engrossed in the game, and was oblivious to us dancing the Boogaloo behind him." "She was so engrossed in her book, she never noticed that she missed her bus."
Thomas Jefferson