古往今来[kooukonrai] in all ages
古今[kokon] ancient and modern times
古今東西[kokontouzai] all times and places
古今無類[kokonmurui] best ever

今か今か[imakaimaka] eagerly waiting
今が今[imagaima] just now
今が今まで[imagaimamade] till just now
今しがた[imashigata] moment ago

一触即発[isshokusokuhatsu] critical (touch and go) situation
即く[tsuku] to ascend (the throne)
即ける[tsukeru] to install (a king, emperor, etc.)
色即是空[shikisokuzekuu] form is emptiness
即する[sokusuru] to conform to

即ち[sunawachi] that is
即位[sokui] enthronement
即応[sokuou] compliance
即興[sokkyou] improvisation
即興曲[sokkyoukyoku] impromptu (musical)