a. Good fortune or good luck in life generally or in a particular affair; success, prosperity. Now rare.Sometimes difficult to distinguish from sense 2a. In later use chiefly in to have the happiness to : to be fortunate enough or have the privilege to (do something).
b. An instance or cause of good fortune. Frequently in plural (in later use often as part of a stylized formula for wishing good fortune).Sometimes difficult to distinguish from sense 2b.
a. The state of pleasurable contentment of mind; deep pleasure in or contentment with one's circumstances.the greatest happiness of the greatest number: see greatest adj., n., and adv. Phrases a.
b. An instance or source of pleasure or contentment.
3. Successful or felicitous aptitude, fitness, suitability, or appropriateness; felicity. Also: an instance of this. Now rare.
happiness is —— : used to express that contentedness is achieved by means of the stated item, experience, situation, etc.
General attributive, esp. with reference to measuring the level of contentment of a person or group of people, as happiness index, happiness level, etc.
► indicates date of composition for this text (as opposed to date of documentary evidence). More