Etymology
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confirm (v.)

mid-13c., confirmyn, confermen "to ratify, sanction, make valid by a legal act," from Old French confermer (13c., Modern French confirmer) "strengthen, establish, consolidate; affirm by proof or evidence; anoint (a king)," from Latin confirmare "make firm, strengthen, establish," from assimilated form of com"together," but here perhaps an intensive prefix (see con-), + firmare "to strengthen," from firmus "strong, steadfast" (from suffixed form of PIE root *dher- "to hold firmly, support").

From mid-14c. as "make firm or more firm, add strength to;" late 14c. as "make certain or sure, give an assurance of truth, verify." Related: Confirmative; confirmatory.

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Definitions of confirm

confirm (v.)
establish or strengthen as with new evidence or facts;
his story confirmed my doubts
confirm (v.)
strengthen or make more firm;
The witnesses confirmed the victim's account
Synonyms: reassert
confirm (v.)
make more firm;
confirm (v.)
support a person for a position;
The Senate confirmed the President's candidate for Secretary of Defense
confirm (v.)
administer the rite of confirmation to;
the children were confirmed in their mother's faith
From wordnet.princeton.edu