INITIAL
Definition of INITIAL
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The first letter of a word or a name.
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In plural, the first letter of each word of a person's full name considered as a unit.
"You can get your initials printed at the top."
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A distinguished initial letter of a chapter or section of a document.
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To sign one's initial(s), as an abbreviated signature.
"Please initial each page and sign the contract in full at the bottom."
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Chronologically first, early; of or pertaining to the beginning, cause or origin.
"Our initial admiration for their efficiency gave way to disgust about their methods."
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Spatially first, placed at the beginning, in the first position; especially said of the first letter of a word.
"The initial letter of names is usually printed with a capital letter."
Source: Wiktionary