What's the "single" derivation of omni?

Question

So we know "omni" is a prefix indicating encompassing of everything. We could say, omnidirectional for example, which is "receiving signals from or transmitting in all directions."
What would be the counterpart for just a single direction?
I just found this resource so maybe the answer is "uni"?

Jason Bassford · Accepted Answer

Note: I provided the following answer before the question was edited to suggest the same word. However, it confirms the suggestion.

What you're looking for is uni-:

[Merriam-Webster]
: one : single
// unicellular

In the example in the question, the complement of omnidirectional is unidirectional.

Decapitated Soul · Answer

Mono- could also be used.

A prefix that means “one, only, single,” as in monochromatic, having only one color.
It is often found in chemical names where it means “containing just one” of the specified atom or group, as in carbon monoxide, which is carbon attached to a single oxygen atom.

[Dictionary.com]

What's the "single" derivation of omni?

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