Answer to Question 1
An extended definition is a longer and more detailed explanation of a
word or term. The writer might use any of the other modes of development
in an extended definition.
Answer to Question 2
A formal definition explains the meaning of a word or term by assigning it
to the class of items to which it belongs and then explaining how the word
or term differs from other items of that class. A formal definition relates to
classification by assigning the word or term to the class of items to which
it belongs.
Umberto Boccioni, Development of a Bottle in Space.
Super's Five Stages of Career Development
Cognitive Development of Children (4 of 4)
Slopes and Soil Development
Development of the Endocrine System
Development of the Eyes and Ears: External View - 28 days Embryo