අවශ්ය
අවශ්ය දෙය
ප්රත්යය
සාධ්යතාව
basic
bounden
essential
formal
instant
integral
material
must
natural
necessary
needful
obligatory
pivotal
positive
prerequisite
required
requisite
specific
affix
cause
concept
condition
ending
notion
suffix
thesis
feasibility
