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Lay person
In a research context, a lay person usually has expertise and experience in areas other than the research speciality.
For instance, they may be / have been a patient or carer, alongside many other life and work experiences.
Lay Summary
A lay summary is a short summary of a research publication or research proposal written in plain language.
These are non-technical summaries written in a way so that everyone can understand the research that people are talking about.