Simple past tense and past participle of initial.(verb)
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Use "initialed" in a sentence
"Swiss Finance Minister Hans-Rudolf Merz said he and German Finance Minister Wolfgang Schaeuble had "initialed" a basic agreement that must now be reviewed by the German and Swiss governments."
"I can't think of any "initialed" person I don't adore."
"The file of slides, the envelopes and the test tubes were identified by computer-generated labels initialed by me, the fruits of yet one more of Margaret’s programs."