In the middle of October.

Synonym of eightysomething: a person between 80 and 89 years old.

Of or related to eightysomethings.

(geometry) Shaped like an octagon, in having eight sides and eight angles.

(paper, printing) A sheet of paper 7 to 10 inches (= 17.78 to 25.4 cm) high and 4.5 to 6 inches (= 11.43 to 15.24 cm) wide, the size varying with the large original sheet used to create it. It is made by folding the original sheet three times to produce eight leaves.

(of fuel) Having a high octane number, good anti-knock characteristics; used in high performance vehicles. / (by extension) High powered, energetic, forceful or dynamic.

A measure of the antiknock properties of an automobile fuel; isooctane having an octane number of 100, a fuel with the same antiknock properties as a mixture of 90% isooctane and 10% heptane having an octane number of 90.

(chemistry) Any isomer of octane except the normal, straight-chain one; especially 2,2,4-trimethylpentane.

(US politics) An occurrence that unexpectedly comes to public attention just prior to a November election, especially a presidential election, and that is likely to affect the outcome.

(chemistry, of an acid) containing eight replaceable hydrogen atoms / (chemistry, of a salt) having eight atoms of a univalent metal