Used in superlative expressions with words like 一番, 最も, 最悪 to mean 'the most ... so far' or 'the ...-est to date'. Often appears in the pattern これまでで一番〜.
See also: 今までで (いままでで)
It was the most delicious ramen I've had so far.
It was the hardest exam to date.
Rare kanji form; learners should use the kana spelling.
Rare kanji form using 迄; learners should use the kana spelling.
Compound of これ (this) + まで (until) + で (particle indicating scope). The phrase literally means 'within the range up to now'.