として
1
as (i.e. in the role of);for (i.e. from the viewpoint of)
政治家として、彼は、演技のうまさを目一杯活用している。
As a politician, he makes utmost use of his acting ability.
2
apart from ... (used to change the topic)
3
even (e.g. "not even a single person")
before a negative form
私たちの中で１人としてあなたを助けたいと思わない者はありません。
There is not one of us who does not want to help you.
4
thinking that ...;trying to ...
after a volitional form
See also:
賭する (とする)
彼女は宝石を盗もうとして捕まった。
She was captured trying to steal jewelry.