AGREE'ABLY, adverb

1. Pleasingly; in an agreeable manner; in a manner to give pleasure; as, to be agreeably entertained with a discourse.

2. Suitably; consistently; conformably;

The effect of which is, that marriages grow less frequent, agreeably to the maxim above laid down.

This is a gross error, proceeding from mistake. agreeably signifies, in an agreeable manner; but this is not the sense, nor does the word modify the verb grow. The sense is, marriages grow less frequent, which [fact, or whole member of the sentence, or proposition] is agreeable to the maxim above laid down. This use of agreeably is common, but grossly erroneous.

3. Alike; in the same manner.

Both armed agreeably obsolete