1) a catching, capture, to be taken
Part of Speech: noun feminine
From a collateral form of G138; capture: - be taken.
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 ἅλωσις; click on the second column to search for that grammatical form of the root ἅλωσις; click on the third column to search for that word and grammatical form; click on the total to search for the root ἅλωσις.