Amines: Weak Bases from a Nitrogen Lone Pair
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An amine contains a nitrogen bonded to carbon or hydrogen atoms and carrying a lone pair, which makes amines weak bases the way ammonia is.
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Methylamine accepts a proton from water to form the methylammonium cation, the same way ammonia does.
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An amine's basicity comes from nitrogen's lone pair, not resemblance to a hydroxide-containing base — amines contain no hydroxide ion.