LINK / CITE ADD TO WORD LIST. noun. The definition of a perusal is the examination or reading of something paying attention to details. An example of perusal is the reading of help wanted ads in hopes of securing a job.the act or an instance of perusing. Noun.he definition of a perusal is the examination or reading of something paying attention to details. An example of perusal is the reading of help wanted ads in hopes of securing a job. the act or an instance of perusing. Noun.