Cardinal
<kard-en-nul>
primary; pivotal; essential;
the most important element or key thing.
The cardinal rule for running is to lift your knees and pump your elbows.
Memory trick:
cardinal reminds of card.
we have an instruction card for what is important.
At work:
The cardinal requirement of a salesperson is to greet with a smile.
(c) 2016 E. Carruthers
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