There has been research done in the

There has been research done in the area of shrinking the charger in order to make it easier to carry with the phone. One
study in particular went on to find the lower limit of charger size.
But as small as the charger becomes, it still needs to be plugged in to a wall outlet. How can something be called
“wireless” when the object in question is required to be plugged in, even though periodically?