eternal

As an adjective eternal

is lasting forever; unending.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As adjectives the difference between infernal and eternal

is that infernal is of or relating to hell, or the world of the dead; hellish while eternal is lasting forever; unending.

As a noun infernal

is (obsolete) an inhabitant of the infernal regions.

As adjectives the difference between momentary and eternal

is that momentary is for only a moment while eternal is lasting forever; unending.

As an adjective eternal

is lasting forever; unending.

As a noun authority is

(label) the power to enforce rules or give orders.

As adjectives the difference between eternal and sustainable

is that eternal is lasting forever; unending while sustainable is able to be sustained.

As adjectives the difference between eternal and lifelong

is that eternal is lasting forever; unending while lifelong is extending for the entire duration of life.

As adjectives the difference between eternal and false

is that eternal is lasting forever; unending while false is (label) one of two states of a boolean variable; logic.

As an adjective eternal

is lasting forever; unending.

As a noun lifetime is

the duration of the life of someone or something.

As an adjective eternal

is lasting forever; unending.

As a noun longevity is

the quality of being long-lasting, especially of life.