《?a1350》

mke crtain 確かめる (ascertain) 〔of〕 〈that〉.

・make certain of one's reservation 予約を確かめる.

・How can you make certain (that) your team will win this game? 君のチームがこのゲームに勝つとどうして自信をもって言えるの.

pron. [〜 of として; 複数扱い] 《文語》 〔…のうちの〕いくらか, いくつか (some).

・certain of his experiences, actions, etc.

adv. 《方言》 ＝certainly.

《a1300》 (O)F 〜 ＜ VL certnu(m) ← L certus sure ← cernere to sift ← IE krei- to cut, separate (Gk krnein to separate, judge): cf. critic cer・tain・ly /stli, -n- ｜ st-, -tn-/