From BiblePortal Wikipedia

King James Dictionary [1]

Hap'Py a. from hap.

1. Lucky fortunate successful.

Chimists have been more happy in finding experiments, than the causes of them.

So we say, a happy thought a happy expedient.

2. Being in the enjoyment of agreeable sensations from the possession of good enjoying pleasure from the gratification of appetites or desires. The pleasurable sensations derived from the gratification of sensual appetites render a person temporarily happy but he only can be esteemed really and permanently happy, who enjoys peace of mind in the favor of God. To be in any degree happy, we must be free from pain both of body and of mind to be very happy, we must be in the enjoyment of lively sensations of pleasure, either of body or mind.

Happy am I, for the daughters will call me blessed.  Genesis 30

He found himself happiest, in communicating happiness to others.

3. Prosperous having secure possession of good.

Happy is that people whose God is Jehovah.  Psalms 144

4. That supplies pleasure that furnishes enjoyment agreeable applied to things as a happy condition. 5. Dexterous ready able.

One gentleman is happy at a reply, another excels in a rejoinder.

6. Blessed enjoying the presence and favor of God, in a future life. 7. Harmonious living in concord enjoying the pleasures of friendship as a happy family. 8. Propitious favorable.

Webster's Dictionary [2]

(1): ( superl.) Experiencing the effect of favorable fortune; having the feeling arising from the consciousness of well-being or of enjoyment; enjoying good of any kind, as peace, tranquillity, comfort; contented; joyous; as, happy hours, happy thoughts.

(2): ( superl.) Favored by hap, luck, or fortune; lucky; fortunate; successful; prosperous; satisfying desire; as, a happy expedient; a happy effort; a happy venture; a happy omen.

(3): ( superl.) Dexterous; ready; apt; felicitous.