It doesn't make sense... I thought of Latinum as in sermonem Latinum... Latine means "in Latin", as an adverb, right? Lewis & Short give Latino for in Latin, and they don't have Latine (in Perseus)... My doubt is more toward Latinitas, but I'm not sure if "Latinitatem discere" makes sense. However, perhaps I should use "et sermonem Latinum disce", not suppressing the sermo.Latine disce.