Against

1. prep. By of before the time that; in preparation for; so as to be ready for the time when.
2. prep. Abreast; opposite to; facing; towards; as, against the mouth of a river; — in this sense often preceded by over.
3. prep. From an opposite direction so as to strike or come in contact with; in contact with; upon; as, hail beats against the roof.
4. prep. In opposition to, whether the opposition is of sentiment or of action; on the other side; counter to; in contrariety to; hence, adverse to; as, against reason; against law; to run a race against time.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.