"Dept" is a short form of the word "department." It refers to a specific section or area within an organization, typically used in a business context. Full definition
Start with the bloat and waste in Depts of Education and Health and Human Services whose combined budgets are much larger than the DoD. (religion.blogs.cnn.com)
Shout out to Terri Cole at the service dept in Lancaster, Texas. (yellowpages.com)
In dept knowledge of positioning raw materials and using material moving equipment. (coverlettersandresume.com)