Definitions of regression analysis on the Web:

• the use of regression to make quantitative predictions of one variable from the values of another
  wordnetweb.princeton.edu/perl/webwn

• In statistics, regression analysis refers to techniques for the modeling and analysis of numerical data consisting of values of a dependent ...
  en.wikipedia.org/wiki/Regression_analysis

• is a mathematical procedure which is used to determine and measure the predictive relationship between one variable (dependent variable) and one or more other variables (independent variables). (420.01.1h)
  www.indiana.edu/~iuaudit/glossary.html

• A statistical technique that can be used to estimate relationships between variables.
  biz.yahoo.com/glossary/bfglosr.html

• A statistical technique for determining the line of the best fit.
  cbpc.blog.co.in/2008/11/12/glossary/

• The statistical technique of finding a straight line that approximates the information in a group of data points. ...
  www-personal.umich.edu/~alandear/glossary/r.html

• The representation of a variable by a regression function.
  amsglossary.allenpress.com/glossary/browse

• A data analysis approach that is used to predict one variable by knowing one or more other variables. ...
  www.etr.org/recapp/research/researchglossary.htm

• A mathematical analysis in which each project surveyed is plotted on a scatter diagram using rent by unit type and the project's comparability index. From this graph a regression line is identified which identifies the market-driven rent at any given comparability index level.
  www.danter.com/METHOD/glossary.htm

• A method of determining relationships among different data in order to predict future behavior/results.
  www.marketsmithinc.com/glossary_industry.php

• ordinary least squares. The method that is used to estimate statistically the regression line and the value of Y = a + bX.
  www.bized.co.uk/learn/sheets/glossary.htm

• Regression analysis is a test that allows one to predict outcomes and explain the interrelationships among variables. ...
  www.mac1988.com/2010/registration/12_11_03/StatisticsGlossary.doc

• Determination of parameter values for a chosen (linear or nonlinear) function to best fit a set of observations.
  www.nature.com/nrd/journal/v3/n11/glossary/nrd1549_glossary.html