Making definitions

1. Definition requirements

1.1. no negativity

1.2. clarity/distinctness

1.3. not picturesque

1.4. conciseness

1.5. adequacy

2. Using keywords and scientific terms

3. Containing

3.1. definienda

3.2. definientia

4. Structures used in definitions

4.1. Synonyms

4.2. Relative clauses

4.3. Reduced relative clauses

4.4. Present simple

4.5. Infinitives

4.6. Passive