Which aircraft type?
AFAIK the term optimum altitude is used across many different Boeing types, but will indicate the same parameter. It was "created" for fleets starting from the 737-classic and still remains available on ie B777 (some have the ability to upload wind data inflight, some don't). There are always wind/altitude tradeoff tables that can be used to have more correct information.
Some Boeing FMCs provide "recommened" altitudes that take wind into account for a limited section in front of the route (I believe the 777 has this indicated), as wind data is considered only a forecast.