simple past tense and past participle of quadruple

Being four times as long, as big or as many of something.

Something that is four times the usual number, amount, size, etc. / (skating) A figure-skating jump with four revolutions in the air.

(transitive) To multiply by four. / (intransitive) To increase by a factor of four. / (rail transport) To provide four parallel running lines on a given stretch of railway.

simple past tense and past participle of quadruplicate

replicated four times

in quadruplicate: four times over, in four copies

having four parts / four times over, multiplied by four

To replicate four times; to make fourfold; to quadruple.

multiplication by four