To Scan

1. (transitive) To examine sequentially, carefully, or critically; to scrutinize; to behold closely. [from 16th C.]
2. (transitive) To look about for; to look over quickly. [from 19th C.]
   1. (computing, transitive) To inspect, analyze or go over, often to find something.
   2. (computing, transitive) To perform lexical analysis; to tokenize.
3. (computing, transitive) To create a digital copy of an image using a scanner.
4. (computing, transitive) To read with an electronic device.
5. (obsolete, transitive, originally) To mount by steps; to go through with step by step.
6. (poetry, transitive) To read or mark so as to show a specific meter. [from 14th C.]
   1. (intransitive) To conform to a metrical structure.