The prefix meaning one, or single, is uni, as in a unicycle, which has only one wheel. Bi means two, as in a bicycle, which has two wheels. Tri means three, as in a tricycle, which has three wheels. To take it one step further, quad means four, as in a quad cane, which is a walking cane with four legs.
"Mono" can be used as prefix which gives the meaning as one.
Uni
Does prefixes mean to or toward. One common word with this prefix is about.
one- unique- single- simple-
The mean of prefixes for beneficial is "having a good effect or favorable result."
Both of does prefixes mean not. In this case, these prefixes make words the opposite of what they mean.
What do not mean in a prefixes
Super or supra.
Counter
idfk
The prefixes il, im, and ir all mean "not" or "opposite of." They are used to negate the meaning of the base word that follows them.
it means robert in latin prefixes
Dis means away
bi-sect