Made up of two matching or complementary elements

• You'll have to pay double.

  Tatoeba · _undertoad · CC BY 2.0 FR

• I'll pay double the price.

  Tatoeba · CK · CC BY 2.0 FR

Of twice the quantity

Of a family relationship, related on both the maternal and paternal sides of a family

Designed for two (people, cars, etc.)

Folded in two; composed of two layers

Stooping; bent overrare

Having two aspects; ambiguousrare

False, deceitful, or hypocriticalrare

Of flowers, having more than the normal number of petalsrare

Of an instrument, sounding an octave lowerrare

To multiply by two

• The world population will soon be doubled.

  Tatoeba · uxintro · CC BY 2.0 FR

• This will let us quickly double the number of sentences.

  Tatoeba · AlanF_US · CC BY 2.0 FR

To increase by 100%, to become twice as large in size

To be the double of; to exceed by twofold; to contain or be worth twice as much as

To fold over so as to make two folds

Twice over; twofold; doubly

• Last month this program cost double what it costs today.

  Tatoeba · eggershead · CC BY 2.0 FR

Two together; two at a time

Into two halves or sectionsrare