1) to be hidden, to be hidden from one, secretly, unawares, without knowing
Part of Speech: verb
A prolonged form of a primary verb, which is used only as an alternate in certain tenses; to lie hid (literally or figuratively); often used adverbially unwittingly: - be hid, be ignorant of, unawares.
|c not know||28.14|
|a escape notice||28.83|
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root λανθάνω; click on the second column to search for that grammatical form of the root λανθάνω; click on the third column to search for that word and grammatical form; click on the total to search for the root λανθάνω.