Webster's Revised Unabridged Dictionary · 1913

Forehand

Forehand , noun

1.
All that part of a horse which is before the rider. — Johnson
2.
The chief or most important part. — Shakespeare
3.
Superiority; advantage; start; precedence.
And, but for ceremony, such a wretch... Had the forehand and vantage of a king. — Shakespeare

Forehand , adjective

Done beforehand; anticipative.
And so extenuate the forehand sin. — Shakespeare