ad. In a parallel direction; in a parallel manner.
the GNU version of the Collaborative International Dictionary of English
ad. In a parallel manner; with parallelism.
The Century Dictionary and Cyclopedia
In a parallel manner; as a parallel or as parallels; in a corresponding manner; concordantly.
Word Usage
"ACKs completed the reading pleasure when parallelly one would read some serious books and the non Indian authors whose settings were alien to me as a child."