weightlessness

As a letter s

is the letter s with a.

As a noun weightlessness is

(uncountable) the state of being free from the effects of gravity.

As nouns the difference between weightlessness and heaviness

is that weightlessness is (uncountable) the state of being free from the effects of gravity while heaviness is the state of being heavy; weight, weightiness, force of impact or gravity.

As nouns the difference between freefall and weightlessness

is that freefall is the state of being in a motion affected by no acceleration (force) other than that provided by gravity while weightlessness is the state of being free from the effects of gravity.

As a verb freefall

is to drop in a state of freefall.

As nouns the difference between gravitation and weightlessness

is that gravitation is gravitation while weightlessness is (uncountable) the state of being free from the effects of gravity.

Buoyancy is a synonym of weightlessness.

As nouns the difference between buoyancy and weightlessness

is that buoyancy is (label) the upward force on a body immersed or partly immersed in a fluid while weightlessness is (uncountable) the state of being free from the effects of gravity.

Lightness is a related term of weightlessness.

In uncountable|lang=en terms the difference between lightness and weightlessness

is that lightness is (uncountable) the relative whiteness or transparency of a colour while weightlessness is (uncountable) the state of being free from the effects of gravity.

In countable|lang=en terms the difference between lightness and weightlessness

is that lightness is (countable) the product of being illuminated while weightlessness is (countable) an experience or instance of being weightless.

As nouns the difference between lightness and weightlessness

is that lightness is (uncountable) the condition of being illuminated or lightness can be the state of having little weight, or little force while weightlessness is (uncountable) the state of being free from the effects of gravity.

Floatability is a related term of weightlessness.

As a noun weightlessness is

(uncountable) the state of being free from the effects of gravity.

As nouns the difference between taxonomy and weightlessness

is that taxonomy is the science or the technique used to make a classification while weightlessness is (uncountable) the state of being free from the effects of gravity.