Unit of Learning - An organised series of learning activities and materials that key in on a specific topic related to the curriculum as a whole. For example, a unit on the solar system within the science curriculum could include textbook content, a visit to the planetarium, a movie on the planets, creation of the planets from paper mache balls, etc. The use of many and varied activities is believed to provide a more in-depth look at the subject area and an enhancement of learning through high-interest activities. (The Cyclopedic Education Dictionary  LB 15 S73 1998 EDUC RF) 

Lesson Plan - An outline prepared by a teacher covering the important points of a lesson arranged in the order in which they are to be presented. (Dictionary of Education  LB 15 G64 EDUC RF)

Typically lesson plans follow this format in writing:
1. general goals
2. specific objectives
3. materials and equipment needed
4. introduction and procedure
5. lesson conclusion
6. lesson follow-up
7. lesson evaluation by student [and teacher]
8. lesson evaluation by a cooperating practitioner or mentor.
(The Cyclopedic Education Dictionary  LB 15 S73 1998 EDUC RF)