What it means
及び means “and” or “as well as.” It is a formal coordinating conjunction used mainly to connect nouns and noun phrases, especially in official documents, reports, regulations, announcements, and other organized writing. It presents the connected items as members of the same list and is more formal than と or や. It can also connect larger expressions in highly formal writing, but noun coordination is its most typical use.
Usage note
及び is not normally replaced by a polite sentence ending because it is a conjunction rather than a plain or polite inflection. Do not confuse it with および written in kana; the meaning is the same, but the kanji form is especially common in formal written contexts.
Example sentences
申請書には氏名及び連絡先を正確に記入してください。
Please enter your name and contact information accurately on the application form.
式典では、来賓及び教職員が前方の席に着席します。
At the ceremony, the guests of honor and faculty members will take their seats in the front.
研究報告書には調査方法及び分析結果を