expression
Used as a conjunction-like expression meaning 'toward', 'regarding', or 'per'. Often follows a noun or noun phrase. Equivalent to に対して, but slightly more casual or abbreviated.
See also: に対して
この問題に対して、どう思いますか。
What do you think about this problem?
一人に対して一つずつ配ってください
Please hand out one per person.
More formal and standard; 対して is a slightly abbreviated form used in casual speech or writing.
Abbreviated form of に対して, from the verb 対する (to face, to be opposite) in the て-form.