Modifier
Modifier (empire) in the Stellaris encyclopedia: Modifiers are bonuses or penalties that typically arise from decisions made during Anomalies or Event Chains.
Modifier in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Modifiers are bonuses or penalties that typically arise from decisions made during 
Anomalies or Event Chains.
They can be temporary or permanent and may apply to the entire empire or a specific part of it, such as a planet.
Modifiers affecting the entire empire are displayed in the Empire of the 
Empire View, while those specific to planets appear in the Colony View.
Entries that mention Modifier
More in Empire
Source: common/game_concepts (concept_modifier, also concept_modifiers, concept_empire_modifier, concept_empire_modifiers, concept_planet_modifier, concept_planet_modifiers) and localisation/english, Stellaris Cygnus v4.5.2 (9776).