(figuratively) Sexual intercourse or a sexual encounter.

(UK, archaic) Turkish delight

(Hong Kong) Fuck you.

a gliding aircraft with a delta wing

plural of delta glider

The birth of a foal that is still wrapped in the placenta (a case of premature placental separation).

(chemistry) A notation for denoting the prevalence of an isotope, equal to the normalized ratio of one isotope to another in a sample relative to that same ratio in a standard.

(finance) A second-order measure of derivative price sensitivity, expressed as the instantaneous rate of change of delta with respect to time.

(finance) A measure of derivative price sensitivity with respect to changes in the correlation between the underlying assets in a multi-asset option.

One of 64 counties in Colorado, United States. County seat: Delta. Named after the county seat, which is situated on a delta.