This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or quality of being aggressive.

n. The result or product of being aggressive.

n. The quality of being aggressive; the disposition to encroach upon or attack others.

n. the quality of being bold and enterprising

n. a natural disposition to be hostile

n. a feeling of hostility that arouses thoughts of attack

"I'm going to ask you that same question, because I think there are those who would argue that a certain aggressiveness is - a swagger, if you want to call it that - is part the personality that's required to do that job."

ill will    hostility    enmity   

possessiveness   

fierceness    aggression    harshness    ferocity    boldness