Technical Definition Assignment
Original idea from Judy Hauser (DMACC) with modifications by Bob Corey (ISU)
Part 1: Evaluate the following samples of technical definitions.
Read the following four examples of technical definitions, which have been taken from web sites
that are designed to provide information for general readers, and then evaluate each example
using the questions given below all four examples. Please use complete sentences, and discuss
and expand any “yes” or “no” answers.
Example A: Definition of pigment.
A pigment is any substance that absorbs light. The color of the pigment comes from the
wavelengths of light reflected (in other words, those not absorbed). Chlorophyll, the green
pigment common to all photosynthetic cells, absorbs all wavelengths of visible light except green,
which it reflects to be detected by our eyes. Black pigments absorb all of the wavelengths that
strike them. White pigments/lighter colors reflect all or almost all of the energy striking them.
Pigments have their own characteristic absorption spectra, the absorption pattern of a given
pigment.
Absorption and transmission of different wavelengths of light by a hypothetical pigment. Image
from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates
(www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.
Example B: Definition of alternation of generations.
The regular alternation of forms or of mode of reproduction in the life cycle of an organism, such
as the alternation between diploid and haploid phases, or between sexual and asexual
reproductive cycles. Also called metagenesis, xenogenesis. http://www.thefreedictionary.com/
Example C: Definition of photosynthesis.
Photosynthesis is the fundamental process that maintains life on earth. Living cells convert food
into energy and structural components. Almost all organisms derive this food, directly or
indirectly, from the organic compounds formed within plants during photosynthesis. The stored
energy in these compounds is essential for growth, repair, reproduction, movement, and other
vital functions. Without photosynthesis, not only would replenishment of the fundamental food
supply halt, but the earth would eventually become devoid of oxygen.
Example D: Definition of Sickle Cell Anemia
You will find an example of an extended definition at the following site:
http://www.io.com/~hcexres/textbook/def_ex.html
This information is provided and maintained by David A. McMurrey. For information on use,
customization, or copies, e-mail hcexres@io.com.
Evaluate each technical definition based on the criteria listed below. Please explain your “yes”
and “no” answers.
1. What is the type of definition (parenthetical, sentence, expanded)?
2. Do you understand the definitions? (Do the definitions adequately define the terms?) If
so, what makes them clear? If not, what is missing?
3. Does the definition adequately classify the term? Explain your answer.
4. Is the type of definition suited to its purpose and user’s needs? Identify the intended
purpose, the audience, and the audience’s need for such a definition.
5. Does the definition clarify, rather than obscure the meaning? Explain how that is done.
What techniques are used to make the meaning clear/obscure?
6. Are the definitions adequately developed? (Are they complete? For example, are any
questions left unanswered?) Provide examples.
7. Are visuals, if used, employed adequately and appropriately? Explain how the visuals
help or hinder the definitions.
Grading criteria: Answers to questions are complete sentences. Yes/no answers are explained
using complete sentences.
Part 2: Detach and hand in. Select a term or concept from your field and write a definition
similar to those in Part 1. Use at least one visual to aid definition. (Attach definition)
Name:
Term:
Sentence Definition: