longtime

As an adjective longtime

is having endured for a long period of time.

As an adverb forever is

(duration) for all time, for all eternity; for an infinite amount of time.

As a noun forever is

an extremely long time.

As an adjective longtime

is having endured for a long period of time.

As an adverb once is

before.

As a noun once is

before.

As adjectives the difference between senior and longtime

is that senior is older; superior while longtime is having endured for a long period of time.

As a noun senior

is someone seen as deserving respect or reverence because of their age.

As adjectives the difference between longtime and longstanding

is that longtime is having endured for a long period of time while longstanding is having persisted for an extended period of time.

As adjectives the difference between lasting and longtime

is that lasting is persisting for an extended period of time while longtime is having endured for a long period of time.

As a verb lasting

is .

As a noun lasting

is continuance; endurance.

As adjectives the difference between longtime and longterm

is that longtime is having endured for a long period of time while longterm is an alternative spelling of lang=en.

As adjectives the difference between lifelong and longtime

is that lifelong is extending for the entire duration of life while longtime is having endured for a long period of time.

is likely misspelled.

has no English definition.

As an adjective longtime

is having endured for a long period of time.

As an adjective longtime

is having endured for a long period of time.

As a noun longtimer is

one who has been a resident, member, etc for a long time.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective longtime is

having endured for a long period of time.