Oath
Definition 1 of 3
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Solemn Pledge
An 'oath' is more serious than a simple promise and often involves a witness or higher authority. In the ceremony, each member recited an oath of loyalty.
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Irrevocable Commitment
When you take an 'oath,' it implies a deep commitment that you can't easily back out of. Upon joining the knights, he swore an oath that bound him for life.
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Cultural Gravity
Oaths may have different weights in various cultures; understood as sacred in some places. In her community, breaking an oath could lead to ostracization.