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The Grammatical Term:  “Abbreviation” is the name for a Grammatical Unit which is a shortened version of a Word or Phrase — used to represent the whole word — but is shortened by eliminating certain letters — usually the vowels — and sometimes, by substituting certain Letters (for example the Abbreviation:  “No.” — used to represent the word “Number”.)
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Another common form of Abbreviation is another Grammatical Unit which is referred to by the Grammatical Term:  “Acronym”.  This particular type of Abbreviation is made by abbreviating a Multi-Word Name, Term, or Phrase — by combining the first letters of the words in the Name, Term, Or Phrase — in-order-to create a new Word;  or simply just a Letter-Combination.  For example:  “NASA” — used to represent the “National Aeronautics & Space Administration” — Or FBI — used to represent the “Federal Bureau Of Investigation”.
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(The Acronym:  “ASAP” — is an Abbreviated Form of the Phrase:  “As Soon As Possible”)

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Finally — Abbreviations also include Mathematical, Computational & other types of Symbols — such as:  +, =, @.  (Though most people are not aware of this form of Abbreviation — and if confronted with this information — they may protest and try to contest this fact…  but it is still a fact) 😉
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• Abbreviation > Abbr.
• Plural > Pl.
• Intelligence > Int.
• TOEFL Excellence > TO-EX

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See Also:

• • Abbreviation — (GiveMeSomeEnglish!!! Blog)
  • Abbreviation & Abbreviations — (Pronunciation Portal)

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