Constructive (adjective)

1. Helping to build or improve something, rather than destroying or hindering it.
2. Being helpful and intended to improve a situation or relationship.

Origin:

From the latin constructus, meaning "built, erected", from construct- meaning "to build".

Examples:

1. The criticism was constructive and helped the project improve.
2. The teacher gave constructive feedback to the students.
3. The discussion was constructive and productive.
4. He received constructive criticism that helped him improve his performance.
5. The meeting was constructive and they came to a resolution.