of or at the beginning

My initial surprise was soon replaced by delight. 我最初的惊讶很快变成了兴奋。

Initial reports say that seven people have died, though this has not yet been confirmed. 最初的报道说有7人丧生，但这一消息还未得到证实。

the first letter of a name, especially when used to represent the whole name

He wrote his initials, P.M.R., at the bottom of the page. 他在页尾写上了他名字的首字母P.M.R.。

Paul M. Reynolds refused to say what the initial "M" stood for. 保罗‧M‧雷诺兹拒绝说出首字母M代表什么意思。

Fill in your first name, middle initial and last name.

They carved their initials into a tree. 他们把自己名字的首字母刻在了树上。

to write your initials on something

If you make any changes to the document, please initial them. 如果你修改了文件，请签上你姓名的首字母。