せんちゃく先着senchaku
1.

The act of arriving at a destination before others; can refer to both the event of being the first to reach and the individual who achieves this.

2.

In the context of a game like Go, it refers to making the first move or gaining priority over an opponent by strategically occupying key positions.

せんちゃくじゅん先着順senchakujun
1.

A method of determining access or service where individuals are prioritized based on their arrival time, benefiting those who arrive earlier.

2.

A system in which rights or opportunities are allocated to participants strictly according to their order of arrival, without waiting lists or reservations.

3.

A principle that governs the distribution of resources or opportunities, ensuring that the first individuals to arrive receive preference over later arrivals.

Example:

先着順に並んでください。