Similarly, adv.
In a similar manner.
Shades of meaning
Fernald has no entry of its own for similarly; he lists it under also.
Where he writes about it:
The words fall into two groups; as well as, besides, in addition, too, withal, simply add a fact or thought; also (all so), in like manner, likewise, similarly, affirm that what is added is like that to which it is added. — from also