The best replacement for abbreviations is acronyms.

The best alternatives to abbreviations are rated as following:
★★★★★  acronyms
★  slang
★  symbols
  acronym

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Speaking about abbreviations, one probably shouldn't forget about periods.

Other search terms related to abbreviations and their ratings are:
★★★★★ periods
★★ apostrophes
★★ periods at end of sentence
★ full stops
★ full stop
capitals
apostrophe
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abbreviations
acronyms
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