Longman Dictionary of Contemporary English homepage

initial

2 noun
     
initial2 [countable]
1 the first letter of someone's first name:
'Can I have your initial, Mr Davies?' 'It's G, Mr G Davies.'
2

initials

[plural] the first letters of all your names in order:
His initials are DPH: they stand for David Perry Hallworth.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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