Source:
Georgia Institute of Technology

"Bioinformatics is the science of developing computer databases and algorithms for the purpose of speeding up and enhancing biological research."

Source:
http://searchdatabase.techtarget.com/sDefinition/0,,sid13_gci211665,00.html

"Bioinformatics: Research, development, or application of computational tools and
approaches for expanding the use of biological, medical, behavioral or health data,
including those to acquire, store, organize, archive, analyze, or visualize such data.

Computational Biology: The development and application of data-analytical and
theoretical methods, mathematical modeling and computational simulation techniques
to the study of biological, behavioral, and social systems."

Source:
NIH Bioinformatics Definition Committee. July 17, 2000.

"…three terms: bioinformatics, computational biology and bioinformation infrastructure are often times used interchangeably, broadly, the three may be defined as follows:
1. bioinformatics refers to database-like activities, involving persistent sets of data that are maintained in a consistent state over essentially indefinite periods of time;
2. computational biology encompasses the use of algorithmic tools to facilitate biological analyses; while
3. bioinformation infrastructure comprises the entire collective of information management systems, analysis tools and communication networks supporting biology."

Source:
Hwa A. Lim, "Biology as a business venture and the rise of bioinformatics", 1996, d-trends-Tech-96-005

"Bioinformatics is conceptualizing biology in terms of macromolecules (in the sense of physical-chemistry) and then applying "informatics" techniques (derived from disciplines such as applied maths, computer science, and statistics) to understand and organize the information associated with these molecules, on a large-scale."

Source:
Luscombe, N. M., D. Greenbaum, and M. Gerstein. 2001. What is Bioinformatics? A proposed definition and overview of the field. Methods Inf Med 40: 346-58.