Usually means: Lacks substances that cause acidity.
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We found 6 dictionaries that define the word acid-free:

General (5 matching dictionaries)
  1. acid-free: Merriam-Webster
  2. acid-free: Wordnik
  3. acid-free: Wiktionary
  4. Acid-free: Wikipedia, the Free Encyclopedia
  5. acid-free: Merriam-Webster

Science (1 matching dictionary)
  1. Archeological Collections Glossary (No longer online)

Definitions from Wiktionary (acid-free)

adjective:  Alkaline or neutral; not acidic.
adjective:  Without using acid.

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