because of; due to; on account of
Formal or written expression indicating reason or cause. Often used in notices, announcements, and formal explanations.
本日は祝日に付き、休業させていただきます。
We are closed today due to the public holiday.
工事中に付き、ご迷惑をおかけします。
We apologize for the inconvenience due to construction work.
Formal equivalent of について. Used in written language or formal speech to indicate a topic.
See also: について
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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'.