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

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n. Intellectual capacity.

n. People of well-developed mental abilities: a country that doesn't value its brainpower.

n. Mental ability; intelligence.

n. Intelligent people considered as a group.

n. mental ability; intellectual acuity.

n. mental ability

"As we know, the qualities of a good leader are many and brainpower is but one."

intelligence   

brain    learning ability    mental capacity    mentality    wit   

enginepowerset    behaviourthat    remake    newcomers'    water power    lamprey    insystem    mind    externalism    synaesthesia