because of; due to; on account of
Formal or written expression indicating reason or cause. Often used in notices, announcements, and formal explanations.
We are closed today due to the public holiday.
Formal equivalent of について. Used in written language or formal speech to indicate a topic.
See also: について
We apologize for the inconvenience due to construction work.
If you have any questions regarding this matter, please let us know.
We will provide one set of materials per participant.
について is the everyday, neutral way to say 'about/regarding', while に付き is a stiffer, written equivalent used in notices and formal documents.
によって expresses cause or means in ordinary speech and writing, whereas に付き in its 'because of' sense is confined to formal notices.
ごとに is the plain way to say 'per/each', matching に付き's distributive 'per' sense but without its formal, business-document tone.
為（ため）is the common, everyday word for 'because of/for the sake of', while に付き conveys the same reason-sense but sounds official and written.
Standard kanji spelling for the expression; the kana form につき is also very common.
Rarely used kanji form; learners should prefer に付き or につき.
Derived from the verb 付く (つく, 'to be attached') in its continuative form 付き, combined with the particle に. The expression developed from the idea of 'being attached to' a reason or topic, giving rise to the formal usages 'because of', 'regarding', and 'per'.