Depression (noun)

1. A state of feeling sad.
2. A medical condition in which a person feels very sad, hopeless, and unimportant for a long time.
3. A period of low economic activity.

Origin:

From latin depressionem, from deprimere (to press down).

Examples:

1. He has been suffering from depression for many years.
2. The country is in the grip of a severe economic depression.
3. The patient has been diagnosed with major depression.
4. The stock market crash of 1929 was a major depression.
5. The Great Depression was a severe economic downturn in the 1930s.