0 a magazine or newspaper, especially on a serious subject, that is published regularly:
She has written for several legal periodicals.
2 a magazine or newspaper, especially on a serious or technical subject, that is published regularly:
It is a small publishing company specializing in periodicals for professionals in the field of transportation.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.