constancyrule

noun
UK /ˈkɒnstənsi ruːl/
US /ˈkɑːnstənsi ruːl/

A constancyrule is a rule that says something must stay the same.

The teacher made a constancyrule that our seats never change.


OTHER MEANINGS

2. A rule in science that keeps a certain amount or value the same.

The constancyrule in the experiment kept the temperature steady.

3. A habit of always following the same rule without changing it.

Her constancyrule made her practice piano every day at four.

4. A rule that promises something will not change over time.

The club's constancyrule means the meeting is always on Friday.