Middle English Dictionary Entry

effectūā̆l, -ē̆l adj.
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Entry Info

Definitions (Senses and Subsenses)

Note: Cp. affectūā̆l adj. Words in affect- and effect- had already undergone a partial merger in Latin. MED has divided them strictly on the basis of form, allowing the semantic overlap to stand. See also the note in OED s.v. effectual adj.
1.
(a) Efficacious, powerful in effect; (b) effective, adequate to its purpose; satisfactory; (c) legally binding, valid; effectual in lawe.
2.
Diligent, earnest, zealous; ~ diligence, sincere effort.