Fortuitous
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Happening independently of human will or means of foresight;resulting from unavoidable physical causes. Abbott.
Fortuitous meaning & definition 1 of Fortuitous.
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extremely lucky, fortunate, unexpected
Fortuitous meaning & definition 2 of Fortuitous.
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(of something that is to your advantage) not planned, happening by chance:
Fortuitous meaning & definition 3 of Fortuitous.