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 (1143), 私 (389), この (375), こと (356), お前 (271), その (260), 次 (227), おまえ (181), こっち (181), こんな (167), あなた (159), 俺 (151), 今年 (146), いい (146), そんな (141), あんた (141), それ (139), 今 (132), 人 (131), こんど (113), そういう (108), 自分 (102), そして (99), ごめん (97), オレ (97)