Meaning ‘one’, ‘alone’

monarch

monarchist

monarchy

monochrome

monochromatic

monocyte

monogamous

monogamy

monoglot

monogram

monograph

monolith

monolithic

monologue

monomaniac

monopolise (US monopolize)

monopolisation (US monopolization)

monopoly

monorail

monosyllable

monotheism

monotheistic

monotone

monotonous