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Both are similar in meaning, but they have different nuances or shades of meaning and are used in different contexts.
Condition
Condition describes the physical state of something or some one:
Considering its age, this house is in excellent condition.
He was in a terrible condition and had drunk far too much whiskey.
Conditions (plural) refer to the environment in which something occurs. We talk about things happening in or under appalling / terrible conditions:
The rescue was attempted under extremely difficult conditions and with little chance of success.
Are you happy with your working conditions? ~ Yes, they are excellent. I have no complaints.
Conditions also describe things that must be true or be done before something else can happen. We talk about meeting or satisfying conditions.
In order to qualify for a grant as a postgraduate student, you will need to satisfy certain conditions.
Terms and Conditions describe the business or financial arrangements of an agreement.
Make sure you read the terms and conditions before you take out the student loan.
On condition that
Note the expression on condition that for saying that one thing will happen only if another thing happens:
You can have the day off tomorrow on condition that you agree to work on Saturday.
Situation
Situation refers to a set of conditions that are in place at a particular time and in a particular place:
If the situation had been different, our marriage might have succeeded.
We also talk about an economic or financial situation:
The financial situation is dire - the company has failed to make a profit in each of the last four years.
Situation comedies / situations vacant
The compound nouns situation comedies (sitcoms) describe amusing TV drama series revolving around a set of characters in a family or organization. Situations vacant refers to a column in a newspaper where jobs are advertised.'The Office' is regarded as one of the most original sitcoms the BBC has produced so far this century.
參考: hkslot from BBC learning english