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Frankly I'm cornered meself a little bit. But not too much tho, I will return to this but first, here are some links:
https://www.britannica.com/topic/nomadism
http://www.iranicaonline.org/articles/nomadism
https://www.jewishvirtuallibrary.org/nomadism
The first problem is there doesn't seem to be a concise definition, compactly fitting into a sentence, but more of somewhat lengthy explanations. The second, while what I wrote are all in there on these links, ofc the editors of these articles widened the parameters enough so one could shoehorn steppe folks into this.
Some notes.
The Encyclopedia Britannica mentions they might cultivate crops.
This actually means they sow some seeds in a place which they leave and move to the next place where they also sow seeds, then when they return to the first place they can harvest the crops, sow again and move to the next place to harvest and sow again. Beside their usual economical activities. These aren't field of wheat or whatnot, don't really plow or anything. It's more like helping certain wild edibles to grow more abundantly. Ofc these can be domesticated plants too I believe.
The EJ actually made me realize a third possible way to be nomad. In an area/region, where the weather is fairly the same year round (like Arabia) they can remain in one climate zone. This isn't true the the Eurasian steppe belt, since winter sets in erry tiem.