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2. In accordance with, or authorized by, the constitution of a state or a society; as, constitutional reforms.
3. Regulated by, dependent on, or secured by, a constitution; as, constitutional government; constitutional rights. Hallam.
4. Relating to a constitution, or establishment form of government; as, a constitutional risis.
Conservatism: same source:The disposition and tendency to preserve what is established; opposition to change; the habit of mind; or conduct, of a conservative.
IOW preserve the Constitution rather than refering to it as that D*** piece of paper.
Best regards.