A Dictionary of the Older Scottish Tongue (up to 1700)
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First published 1951 (DOST Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
Effective, a. [ME. (rare) effectyf (1398), e.m.E. effective (1594), L. effectīvus.] Producing an effect. —c1420 Wynt. ix. 3084.
This wes the proces causative, That efftyr folowit effective