obsolescence

As a noun obsolescence

is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between obsolescence and aging

is that obsolescence is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected while aging is the process of becoming older or more mature.

As a verb aging is

.

As an adjective aging is

becoming elderly.

As nouns the difference between obsolescence and dilapidation

is that obsolescence is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected while dilapidation is the state of being dilapidated, reduced to decay, partially ruined.

As nouns the difference between depreciation and obsolescence

is that depreciation is depreciation while obsolescence is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected.

As nouns the difference between disuse and obsolescence

is that disuse is the state of not being used; neglect while obsolescence is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected.

As a verb disuse

is to cease the use of.

As a verb dilapidated

is .

As an adjective dilapidated

is having fallen into a state of disrepair or deterioration, especially through neglect.

As a noun obsolescence is

(uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected.

As nouns the difference between obsolescence and deterioration

is that obsolescence is the state of being obsolete—no longer in use; gone into disuse; disused or neglected while deterioration is the process of making or growing worse, or the state of having grown worse.

As nouns the difference between obsolescence and tradition

is that obsolescence is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected while tradition is tradition.

As nouns the difference between substitute and obsolescence

is that substitute is a replacement or stand-in for something that achieves a similar result or purpose while obsolescence is (uncountable) the state of being obsolete—no longer in use; gone into disuse; disused or neglected.

As a verb substitute

is to use in place of something else, with the same function.