A mark (✓) made to indicate agreement, correctness or acknowledgement.
In long jump, javelin and similar events, little mark alongside the runway which helps the athlete to set their steps just right for their performance.
That which has significance; a sign; a token; a symbol.
Reasonably large in number or amount.
Having a low probability of occurring by chance (for example, having high correlation and thus likely to be related).
Having a covert or hidden meaning.
Having a noticeable or major effect.
Signifying something; carrying meaning.