Hi! I don't know which approach are you using, or which is the theme related with happiness issue, but when I have read the question, suddenly I have thought about the United Nations' World Happiness Report and the debate on the standards for measuring happiness, and the UN initiative on the Gross National Happiness Index, and so on...
Some useful links in which I'm sure you will find some definition, approach, etc. I hope they will help you in exploring the definition you are searching for:
My personal belief tells me that the key to happiness is within ourselves, through the intelligence to analyse, and to find a better view of life, solving those problems that can be solved, and finding the strength and serenity to accept those that are not solvable.
"Happiness is as grave and practical as sorrow, if not more so. We might as well imagine that a man could carve a cardboard chicken or live on imitation loaves of bread, as suppose that any man could get happiness out of things that are merely light or laughable. The really frivolous man, not unknown in fashionable circles, is the ma who is too frivolous to enjoy himself. "
G.K. Chesterton. A Handful of Authors: Essays on Books and Writers, New York, Sheed and Ward, 1953.
You can't measure and therefore you can't compare different indicators, people or countries, at least not in quantitative terms.
Happiness is too subjective.
I know what happiness is not - pleasing everyone else at the expense of your own value or having a job in a company whose cause you don't adhere to or having a particular position because you need to compete with someone else (very often your own partner which is quite ridiculous), believing that having a job is more important than having love
Agreed with other scholars' comments on how to achieve real happiness. This question reminds me a Chinese proverb "Those who are contented with what they have are often happy."
Other Chinese proverbs about happiness can be found in the following link:
http://cn.hujiang.com/new/p554512/
Can we measure it?
If the above word "measure" refers to the survey instrument to measure happiness in a social science quantitative research, then you can refer to the following link. Suggesting you operationally defined "happiness" before operationalized with the right survey instrument.
Having a dream and being able to work toward its realization, if you can share it with a like-minded person (and if it could be his or her dream as well) even better, and then you will have common dreams.
Happiness could be an endless progression of dreams and the small steps on the way. I think that being involved in what you want to achieve is a key element.
Pietro C, Silvia S, Giuseppe R. The pursuit of happiness measurement: a psychometric model based on psychophysiological correlates. ScientificWorldJournal. 2014;2014:139128. http://downloads.hindawi.com/journals/tswj/2014/139128.pdf
Linley PA, Maltby J, Wood AM, Osborne G. Hurling, RMeasuring happiness: The higher order factor structure of subjective and psychological well-being measures. PERSONALITY AND INDIVIDUAL DIFFERENCES. 2009;47(8):878-884. https://www.researchgate.net/profile/John_Maltby/publication/222561092_Measuring_happiness_The_higher_order_factor_structure_of_subjective_and_psychological_well-being_measures/links/0912f50c39569426b2000000.pdf
Hock-Eam Lim. The Use of Different Happiness Rating Scales: Bias and Comparison Problem? Soc Indic Res. 2008;87:259–267. http://scholar.fju.edu.tw/%E8%AA%B2%E7%A8%8B%E5%A4%A7%E7%B6%B1/upload/042679/handout/971/D-7604-07699-A.pdf
Happy springtime, Martin
Article Measuring happiness: The higher order factor structure of su...