Synonyms of the word

instantaneousness

• n. condition of being instantaneous.

celerity

• n. (literary) Speed.
• n. (oceanography) The speed of individual waves (as opposed to the speed of groups of waves).
• n. (hydrology) The speed with which a perturbation to the flow propagates through the flow domain.

immediacy

• n. the quality of being immediate, of happening right away.
• n. lack of mediation.
• n. (philosophy) immediate awareness or apprehension.

immediateness

• n. the state of being immediate; immediacy.

instancy

• n. insistence, insistency.
• n. immediacy, instantaneousness.

quickness

• n. rapidity of movement or activity; agility or dexterity.

rapidity

• n. speed, swiftness; the condition of being rapid.
• n. (physics) A measure of velocity relative to the speed of light.
• n. (physics) A measure of the velocity of a particle in a beam relative to the beam's axis.

rapidness

• n. The characteristic of being rapid.

speediness

• n. The property of being fast; swiftness.