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abundance (n.): mid-14c., from Old French abondance and directly from Latin abundantia "fullness, plenty," noun of state from abundantem (nominative abundans), present participle of abundare "to overflow" (see abound).
abundant (adj.): late 14c., from Old French abundant and directly from Latin abundantem (nominative abundans) "overflowing," present participle of abundare "to overflow" (see abound). Related: Abundantly.
over-abundance (n.): late 14c., from over- + abundance.
over-abundant (adj.): c. 1400, from over- + abundant.
superabundance (n.): early 15c., superaboundance, from Late Latin superabundantia, from present participle stem of Latin superabundare, from super (see super-) + abundare (see abound). Related: Superabundant; superabound.
abundancy: "The quality or state of being abundant; abundance, plenty; plentifulness. Also as a count noun: a large amount or quantity", Early 16th cent. From classical Latin abundantia; compare -ancy.
abundante cautela: "= ex abundante cautela", Early 18th cent. Shortened from ex abundante cautela.
ex abundante cautela: "By way of extreme caution; as an added precaution", Late 17th cent. From post-classical Latin ex abundante cautela by way of extreme caution from classical Latin ex + abundante, ablative singular of abundāns + cautēlā, ablative of cautēla.