functionally
adv. manner C1 Advanced US //ˈfəŋkʃənəɫi// UK //fˈʌŋkʃənəli// func·tion·al·ly
adv. in a way that relates to how something works or what its purpose is. It can also describe something that is true in practice, even if it is not officially that way.
adv. in a manner relating to the purpose or operation of something; in practical effect though not necessarily by official definition.
The old computer is functionally useless for modern gaming.
Although the two departments are officially separate, they operate functionally as a single team to save time.
The architect designed the building to be functionally efficient, ensuring that the layout maximized natural light while minimizing the energy required for climate control.
Usage
Often used to contrast a practical reality with a formal or theoretical status.