optics ?

[Tony204ing]

When i bought my binos a few years back the guy showed me a pair of multi-coated lenses and a pair of fully-coated lenses.He explained to me that the multi means some of the lenses are coated and fully means all the lenses are coated.My question now is what is the diffrence between fully-coated and fully multi-coated?Im assuming that fully means all the lenses are totaly coated an fully multi means they all have some type of coating just not all the coatings available.Do i have all this right or maybe i have some of them mixed up.