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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Sub·in·dex n.; pl. Subindices  Math. A number or mark placed opposite the lower part of a letter or symbol to distinguish the symbol; thus, a0, b1, c₂, xₙ, have 0, 1, 2, and n as subindices.
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From: WordNet (r) 2.0

 subindices
      See subindex