adverb, noun which may take the genitive case particle 'no'
previously; already; for some time
Indicates that something has been the case or has been planned from an earlier point in time. Often used in formal or written contexts.
かねてより計画していた旅行に、ようやく出発した。
We finally set off on the trip we had been planning for some time.
He became a doctor, which had been his dream for a long time.
The overseas business trip I had been planning for some time finally happened.
The long-standing concern finally became reality.
As previously announced, we will revise our prices starting next month.