0 one of the principles on which a belief or theory is based: --
It is a tenet of contemporary psychology that an individual's mental health is supported by having good social networks.
1 a principle that is an accepted belief of a particular group: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.