Perusal implies a thorough and careful reading, not just skimming over the content. He gave the document a careful perusal before signing it.
Pro Tip 2/3
Formal Usage
The word 'perusal' is formal and mainly used in official or business contexts. Please find enclosed the report for your perusal.
Pro Tip 3/3
Implies Time
'Perusal' suggests taking the time needed to understand or analyze something fully. The scientist's notes were open for perusal by the visiting scholars.