only once; just once
Emphasizes that something happened or will happen a single time, often with a sense of finality or uniqueness.
I met him only once.
Don't miss the once-in-a-lifetime chance.
Standard kanji-kana mixed spelling.
Rare kanji spelling using 唯; learners are more likely to encounter ただ一度.
Compound of ただ (only) and 一度 (one time). The kanji spelling 唯一度 uses 唯 (solely) for the ただ part, but this form is rare.