effective frequency
C2CEFR level
88/100Rarity: very rare
TechnicalRegister
The number of exposures needed before an ad measurably moves a viewer toward action.
Three's our effective frequency for this segment, so anything under that is just wasted impressions.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
Get words like effective frequency on your lock screen, a few a day, with review that makes them stick.
Download on the App Store Lexfall puts a new word on your home and lock screen through widgets, so you learn without opening an app. Free to download. After a free trial, a subscription unlocks every field. Built for iPhone, iOS 15.1 or later.
On a computer?Scan with your iPhone camera.