1
monochrome
having one color; a painting, design, photo or outfit that is only one color
2
monocle
an eyeglass for only one eye
3
monolingual
speaking or writing only one language
4
monolith
something made out of one single large block or piece of stone; one single stone monument
5
monologue
a long speech given by only one person
6
monophobia
an abnormal fear of being the only one there; fear of being alone
7
monopoly
control of a product or service by one company
8
monorail
a track for subway or train cars that have only one rail
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monosyllabic
having only one syllable
10
monotone
a speech in which every word has one tone of voice