instant /ˈinstənt/ I. adj. 1. 紧迫的；即刻的：The sick boy needs instant attention.病孩需要立即救护。2. (食品) 速溶的，方便的：instant foods 方便食品；instant coffee 速溶咖啡 ‖II. n.（常作sing.）时刻：Please go away this instant.请立刻走开。on the instant立即，马上：We were ordered to march off on the instant.命令我们立即出发。this instant 此刻；for an instant 有一会儿 ‖III.conj.the instant…一…就（=as soon as;the moment）：［考句］ You see the lightning the instant it happens, but you hear the thunder later.闪电一发生你就看到光，但过一会儿你才听到雷声。
instantaneous /ˌinstənˈteinjəs/ adj. 瞬间的，即刻的：an instantaneous photograph 快照，即取照片；an instantaneous change 瞬间的变化
