Temporal anomaly
A temporal anomaly or time anomaly was a disruption in the spacetime continuum which can be related to time travel. Temporal anomalies can take many forms and have many different effects, including temporal reversion, the creation of alternate timelines, and fracturing a vessel into different time periods. (; )

In 2373, Q was sad he couldn't go around causing temporal anomalies anymore, since he'd have to take care of his son. ()

Later that year, the  encountered a temporal anomaly in an energy barrier surrounding a planet in the Gamma Quadrant. As a result of this encounter, the Defiant was thrown back in time two hundred years, and subsequently crashed on the planet's surface. Realizing that they had no way to get back to their own time, the crew established a colony on the planet, which they named "Gaia." Two hundred years later, the descendants of the original colonists contacted their counterparts on the Defiant, which had just arrived at the planet. When the crew of the Defiant learned what had happened, and that if they attempted to avoid the encounter with the anomaly that the colonists' timeline would collapse and they would cease to exist, they committed to recreating the accident in order to preserve the lives of their descendants. The plan failed, however, due to the influence of Odo's counterpart, who was still alive after two hundred years, and who reprogrammed the Defiants autopilot in order to save the life of Kira Nerys, with whom he was in love. Scanning the planet, the crew of the Defiant found no trace of the colony, which was erased from existence due to Odo's actions. ()

Temporal anomalies
Anti-time eruption
Energy vortex
Causality loop
Nexus
Space-time fracture
Temporal displacement
Temporal distortion
Temporal explosion
Temporal inversion
Temporal fracture
Temporal fragment
Temporal flux
Temporal rift
Kerr loop

Factors
Chroniton
Temporal mechanics
Time

Effects
Alternate timeline
Temporal causality loop
Temporal paradox

See also
Spatial anomaly
Subspace anomaly

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Anomaly