initial - definition and synonyms

verb [transitive] 

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/ɪˈnɪʃ(ə)l/
present tense
I/you/we/theyinitial
he/she/itinitials
present participleinitialling
past tenseinitialled
past participleinitialled
  1. to write your initials on a document to show that you agree with what it says