To settle (a species, group of people, or the like) in a new place as a colony.(verb)
To begin a new colony.(verb)
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Use "colonise" in a sentence
"That party is the far-right Freedom Party (PVV), of Geert Wilders, the populist firebrand behind the anti-Islamic film Fitna, who has accused Muslims of trying to "colonise" his country."
"The Jews ARE the indigenous inhabitants, and as such cannot 'colonise' their own country."
"South Africa did not want to "colonise" other country's, which it did not have the capacity to do, and would not itself "gain" from this, but would do it rather in the interests of Africa."