~んがため(に)/~んがための      => in order to ~ N1
んがため => For the purpose of doing A N1
Reason, Result, Response
ためしがない => is never the case; has never happened; I have never seen or heard of ~ N1
Criticize
めったに~ない => hardly; rarely; seldom N3
めったにない => Rarely N3
Degree. Level, Amount
[命令「めいれい」] => Do A (command) N4
Can, Should, Must
... いらいはじめて => Since... this is the first time N3
Time
~づめだ      => full of N1
… がいい ... => ... I hope that ... N3
Expected
たいがい => in general N2
Repetition, habit
~ようが...まいが => whether or not; regardless N1
ため => In order to, for N4
Purpose, target