initial

adjective
UK /ɪˈnɪʃ.əl/
US /ɪˈnɪʃ.əl/

Something that comes first or happens at the very beginning.

My initial idea was to walk, but then we took the bus.


OTHER MEANINGS

2. The first letter of a name or word.

Please write your initials on the form.

3. To mark something with your initials to show you agree or wrote it.

The teacher initialed each page of the permission slip.

4. The first stage of a process or plan.

The initial step is to gather all the materials.