1. in a manner that involves or affects two things at the same time; doubly
Usage: formal or literary
2. in a way that is appropriate or suitable for two purposes or contexts
Usage: less common

Examples

• The new policy is dually important because it addresses both safety and efficiency.
• She served dually as both director and treasurer of the organization.
• The building was dually designed to function as a school and community center.
• His role was dually significant in the company's success.
• The law applies dually to citizens and permanent residents.