Used in rankings, competitions, and ordered lists to indicate the top position.
彼は大会で第一位になった。
He took first place in the tournament.
この商品は売上第一位です。
This product is number one in sales.
首位 also means 'first place' but is often used in sports leagues or competitive standings, whereas 第一位 is more general.
Standard kanji spelling.
Variant with Arabic numeral; common in tables and rankings.
Compound of 第 (ordinal prefix) + 一 (one) + 位 (rank, position).