Middle English Dictionary Entry

actī̆f, -ī̆ve adj. as n.
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Entry Info

Definitions (Senses and Subsenses)

1.
A person who is active in a cause.
2.
Phys. & phil. An element or quality of matter capable of acting upon something (as fire, heat, cold, etc.).
3.
Eccl. One who leads the vita activa.
4.