1. act in an official capacity in a ceremony or religious ritual, such as a wedding;

   "Who officiated at your wedding?"
   

2. perform duties attached to a particular office or place or function;

   "His wife officiated as his private secretary"
   

1.主持(仪式)；行使(指定的职务)
When someoneofficiates at a ceremony or formal occasion, they are in charge and perform the official part of it.

e.g. Bishop Silvester officiated at the funeral...
西尔韦斯特主教主持了葬礼。
e.g. A memorial service was held yesterday at Wadhurst Parish Church. The Rev Michael Inch officiated.
昨天，悼念仪式在沃德赫斯特堂区教堂举行，迈克尔·英奇牧师担任主持。

2.（在体育比赛、竞赛等中）担任裁判
When someoneofficiates at a sports match or competition, they are in charge and make sure the players do not break the rules.

e.g. Mr Ellis was selected toofficiate at a cup game between Grimsby and Rotherham...
埃利斯先生获选执法格里姆斯比队与罗瑟汉姆队的一场杯赛。
e.g. Frik Burger willofficiate when the Pumas play Scotland.
弗里克·伯格将担任阿根廷队对苏格兰队比赛的裁判。

1. 执行：officiant 主祭 |officiate 执行 | officinal 药用的

2. 主祭：menorah 烛台 |officiate 主祭 | Chanukah 光明节

3. 行使职务：official visit 正式访问 |officiate 行使职务 | offing 海边