Dic: condition, conditions (as a meaning of: state of sth, circumstances)

state of something

1. [uncountable, singular]△ the state that something is in.
1. N-SING : also no det, with supp△ If you talk about the condition of a person or thing, you are talking about the state that they are in, especially how good or bad their physical state is.

• to be in bad/good/excellent condition
• a used car in perfect condition
• The house is in a generally poor condition.
• He remains in a critical condition in a California hospital.
• The two-bedroom chalet is in good condition.
• You can't drive in that condition.

circumstances

4. conditions [plural]△ the circumstances or situation in which people live, work or do things.
3. N-PLURAL : usu with supp△ The conditions in which people live or work are the factors which affect their comfort, safety, or health.

• living conditions; housing conditions; working conditions
• changing economic conditions
• neglected children living under the most appalling conditions
• a strike to improve pay and conditions
• People are living in appalling conditions.
• He could not work in these conditions any longer.

5. conditions [plural]△ the physical situation that affects how something happens.
2. N-PLURAL : usu with supp△ The conditions under which something is done or happens are all the factors or circumstances which directly affect it.

• The plants grow best in cool, damp conditions.
• freezing/icy/humid, etc. conditions
• Conditions are ideal (= the weather is very good) for sailing today.
• treacherous driving conditions
• This change has been timed under laboratory conditions.
• The mild winter has created the ideal conditions for an ant population explosion.

CF.

• Market structure depends on relative cost and demand factors. ... Cost and demand conditions affect market structures. ...

CF. medical

2. [uncountable, singular]△ the state of somebody's health or how fit they are.

• He is overweight and out of condition (= not physically fit).
• You are in no condition (= too ill/sick, etc.) to go anywhere.
• The motorcyclist was in a critical condition in hospital last night.
• (informal) She shouldn't be driving in her condition (= because she is pregnant).

3. [countable]△ an illness or a medical problem that you have for a long time because it is not possible to cure it.

• a medical condition
• He suffers from a serious heart condition.

5. N-COUNT : usu with supp△ If someone has a particular condition, they have an illness or other medical problem.

• Doctors suspect he may have a heart condition.(= complaint, disorder)

..........  OALD, Cobuild