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Webster 1913 Edition
Invaluably
In-val′u-a-bly
,adv.
 Inestimably. 
Bp. Hall.
 Webster 1828 Edition
Invaluably
INVAL'UABLY
,adv.
  Definition 2025
invaluably
invaluably
English
Adverb
invaluably (comparative more invaluably, superlative most invaluably)
- In an invaluable manner; inestimably.
References
- invaluably in The Century Dictionary, The Century Co., New York, 1911
- invaluably in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913