JMdict: 1004410

こそ

1. [prt] it is ... that ...; precisely; in particular; definitely; for sure; only (when, after, because, etc.)
2. [prt] although; while; it is the case that ... but
3. [prt] it is precisely because ... that ...; only because ...
4. [prt] not at all; not in the slightest; absolutely not; never

Words often seen with this one: (experimental feature)

今度 (1217), 私 (427), この (408), こと (395), お前 (288), その (274), 次 (239), おまえ (196), こっち (196), こんな (175), あなた (168), いい (161), 俺 (159), そんな (154), 今年 (154), それ (153), あんた (150), 今 (140), 人 (140), こんど (125), そういう (121), 自分 (108), ごめん (107), オレ (105), そして (105)