In information technology, migration is the process of moving from the use of one operating environment to another operating environment that is, in most cases, is thought to be a better one. – Margaret Rouse http://www.ghs-mh.de/migration/projects/define/define.htm
The definition of the word migration can be "the movement of people from one place to another". – Sokrates Comenius http://www.urbandictionary.com/define.php?term=migration
When groups of a species make a regular trip or journey to the same or a similar destination or by the same or a similar route. - unlawfultears
a long term change in the earth's climate, especially a change due to an increase in the average atmospheric temperature – Random House Inc.
a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods. - United Nations http://www.ecolife.com/define/climate-change.html
Climate change is the long-term shift in weather patterns in a specific region or globally. – Eva Boucek
broadcasting visual images of stationary or moving objects; "she is a star of screen and video"; "Television is a medium because it is neither rare nor well done" - Ernie Kovacs http://dictionary.reference.com/browse/television
the broadcasting of a still or moving image via radiowaves toreceivers that project a view of the image on a picture tube. –Random House Inc. http://www.merriam-webster.com/dictionary/television
an electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into...