designate: [ 'dezigneit ] 

v. 任命,指派,委派

词形变化:
形容词:designative
名词:designator
动词过去式:designated
过去分词:designated
现在分词:designating
第三人称单数:designates  
例句与用法:
1. The chairman has designated that boyas his successor.  (常与as 连用)
主席已经指定那个男孩作他的继承人。
2. She was designated sportswoman of the year. 
她被指定为本年度的体坛明星。
3.Please park your car in the designated(adj.) area.
请把你的车停在指定的地方.
4.Only designated(adj.) people can modify this webpage.
只有指定的人才可以修改这个网页.

近义词辨析
appoint， designate， assign， name， nominate
　　这些动词均有“任命，委派”之意。
　　appoint
通常指不经过选择的官方委任。
They appointed him president.
　　designate
书面用语，侧重当权者或机构的选拔或任命有时含强行指定的意味。
She was designated the best actress of this year.
　　assign
常指给一群人或个人分配、分派、指派或委派任务。
I was assigned to daily word section.
　　name
普通用词，着重任命的结果，而不是过程。
He is an painter of great name.
　　nominate
通常指为某一公职选择候选人，并将其提交给有决定权的人作最后决定。
We nominated him as a new monitor.

   if i made some mistakes , please help me to correct it , and if  you have more usages of this word, feel free to show us,let's get better together.
   sorry to send this post so early, i have a bad situation of internet at night.