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I sat across from him./I sat opposite him.

Do the sentences mean the exact same?

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anonymousDo the sentences mean the exact same?

Not necessarily.

I'd probably use "opposite" if I was facing him.

I'd probably use "across from" if we were facing the same way.

CJ

Comments  
anonymousDo the sentences mean the exact same?

It depends. At a conference table, if we are face to face with the table between us, you are sitting both across from and opposite me. If we are on a train, and we are both sitting in the same four-seat table nook, you are across the table from me if our knees touch, and you are opposite me at the table, but you have to specify because if we are instead sitting in aisle seats in the same row, you are across from me.