Software Architect's Handbook

What is a ubiquitous language?

The development team may not have a strong understanding of the domain, and may not be familiar with terms and concepts used by stakeholders, including the domain experts. They may use their own language when discussing the functionality and discuss the domain in terms of their technical design. The stakeholders, including the domain experts, will use their own jargon when discussing their domain, and may not have a good understanding of technical terms. Because different people may use different language to describe the same concepts in a particular domain, it can take longer to communicate ideas, and it can lead to misunderstandings.

In Domain-Driven Design: Tackling Complexity in the Heart of Software, Eric ...