anticipatory

adjective
UK /ænˈtɪs.ɪ.pə.tər.i/
US /ænˈtɪs.ə.pə.tɔːr.i/

Feeling excited or ready for something that is going to happen soon.

The children had an anticipatory smile before opening their presents.


OTHER MEANINGS

2. Done in order to prepare for something that might happen.

They took anticipatory steps to keep the roads safe before the storm.

3. Showing that you know something is about to happen.

She gave an anticipatory glance at the door when she heard footsteps.

4. Happening before the usual or expected time.

The anticipatory cheers began before the band even appeared.