Emphasizes that something happens or is done a single time, and no more.
I saw that movie only once.
I'd like to climb Mt. Fuji, even if it's just once.
Standard kanji spelling.
Numeral variant, common in informal or digital writing.
Ateji spelling using 丈 for だけ; rarely used.
Combination of 一度 (いちど, 'once') and the particle だけ ('only').