This word belongs in Frequency Band 5. Band 5 contains words which occur between 1 and 10 times per million words in typical modern English usage. These tend to be restricted to literate vocabulary associated with educated discourse, although such words may still be familiar within the context of that discourse. The shift away from the everyday language found in bands 8-6 is apparent in nouns (e.g. surveillance, assimilation, tumult, penchant, paraphrase, admixture)...

more information on Frequency Bands