My personal definition of a seed round is a round where you don't give up any board seat or special power to investors. After a seed round you should basically work as usual (product, users, product, users, ... nothing else). By this definition, our round qualifies as seed. Managing a board takes time and energy and the more you can delay this, the better (from my experience).

That being said, this is a very subjective notion and everybody is free to have their own.