かいし開始kaishi
1.

The moment when an event or action begins or is set into motion, indicating the transition from a state of inactivity to activity.

2.

The act of commencing an operation, process, or activity, often highlighting the importance of the initial steps taken.

3.

The point in time at which something originates or is instigated, marking the official start of a sequence or event.

4.

The process or act of taking the first actions needed to initiate something, signifying the start of a planned endeavor.

Example:

何時に搭乗開始ですか。

かいしび開始日kaishibi
1.

物事が始まる具体的な日付を指し、プロジェクトやイベントの計画において重要な意味を持つ。

2.

契約やスケジュールにおいて、活動や業務が正式に始まる瞬間を示す日付。

3.

プロセスや期日の起点となる日を示し、時間の経過を計測する上での基準となる。

かいしじこく開始時刻kaishijikoku
1.

The specific point in time when an event, activity, or process initiates or begins.

2.

The predetermined hour or moment at which something is scheduled to commence.

3.

The designated time marking the onset of a planned occurrence or engagement.

4.

The exact moment when a scheduled event is set to start, often used in the context of timetables or agendas.

ほうそうかいし放送開始housoukaishi
1.

The moment when a radio or television program officially begins, marking the initiation of its transmission to the audience.

2.

The scheduled time at which a broadcast goes live, signifying the transition from pre-broadcast activities to the active airing of content.

3.

The event that indicates the start of media distribution, often accompanied by music or announcements that engage viewers or listeners.

しあいかいし試合開始shiaikaishi
1.

The moment when a sporting event officially begins, marking the transition from pre-game activities to competitive play.

2.

The initiation of play in a match, signifying the start of the competition where teams or individuals aim to achieve victory.

3.

The point in time when the participants engage in the game, often heralded by a signal or whistle, establishing the structure of the contest.