Lest
(Other definitions for incase that I've seen before include "For fear that" , "As a precaution" , "On the off chance" , "In order to allow for eventualities" , "line" .)
(Other definitions for in case that I've seen before include "Packed" , "for emergency" , "For fear that" , "As a precaution" , "In order to allow for eventualities" .)