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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 In·de·fat·i·ga·ble·ness, n. Indefatigable quality; unweariedness; persistency.
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From: WordNet (r) 2.0

 indefatigableness
      n : tireless determination [syn: indefatigability, tirelessness]