んがため（に）／～んがための (n-ga-tame): In order to; for the purpose of
～んがため（に）／～んがための (n-ga-tame)
Meaning
In order to; for the purpose of
Formation and usage
V negative stem + んがため（に／の）; する → せんがため
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
An old-fashioned expression of strong purpose, usually with the same agent in both clauses; not a casual request.
Examples
資料を確認せんがために、予定をすべて調整した。
I rearranged my entire schedule in order to check the documents.
先生に相談せんがために、予定をすべて調整した。
I rearranged my entire schedule in order to consult the teacher.
計画を見直さんがために、予定をすべて調整した。
I rearranged my entire schedule in order to review the plan.
会場を下見せんがために、予定をすべて調整した。
I rearranged my entire schedule in order to inspect the venue beforehand.
十分に練習せんがために、予定をすべて調整した。
I rearranged my entire schedule in order to practice thoroughly.
How related patterns differ
べく and んがため state purpose in literary language. がてら and かたがた combine purposes, with かたがた more formal. をきっかけに and を契機に trigger change; を皮切りに starts a series, and を経て passes through a process.