Collins Chinese Dictionary Plus (3rd edition), 2011:
既
jìI 副
already
- 既定 jìdìng fixed
- 既成事实(實) jì chéng shì shí a fait accompli
II 连
1 (表示兼而有之)
- 他字写(寫)得既快又好。 Tā zì xiě de jì kuài yòu hǎo. He writes both quickly and well.
- 他既高又壮(壯)。 Tā jì gāo yòu zhuàng. He 's tall and strong.
2 (=既然) since既来(來)之,则(則)安之。
Jì lái zhī,zé ān zhī. Since we've come, let's make the best of it.