Synonym Boundary: "最初", "初めて", "まず", "上旬", "始発"

When expressing "first" in Japanese, you must carefully distinguish between "最初", "初めて", "まず", "上旬", "始発" based on context.

• 最初 (さいしょ (saisho) - Level: N4): Maps to "first, beginning" and is used when Refers to the initial part or moment of something. Contrasts with 最後.
• 初めて (はじめて (hajimete) - Level: N4): Maps to "for the first time" and is used when Adverb. Used to describe an action or event occurring for the very first time in one's experience or in history..
• まず (まず (mazu) - Level: N4): Maps to "first of all, to begin with" and is used when Used when listing steps or priorities. It indicates the very first action to be taken in a sequence..
• 上旬 (じょうじゅん (jōjun) - Level: N3): Maps to "first third of a month, early part of a month (approx. 1st-10th)" and is used when Refers to the approximate first 10 days of a month. Often used with a month name, e.g., 10月上旬.
• 始発 (しはつ (shihatsu) - Level: N3): Maps to "first train/bus (of the day), originating station" and is used when Can refer to the first service of the day or the station where a service originates. Often used for trains or buses..

Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!