Base Difficulty

Base difficulty: Level 274 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 1381 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr A2 (2 of 6) 2100

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 38.24 2296 100% 2296 1
20th_books 26.92 3013 100% 3013 1
wiki_math 420.38 377 100% 320 2
wiki_geography 0.00 — — — 0
wiki_biology 58.81 2317 100% 2317 1
wiki_modern_life 99.40 1473 100% 1473 1
wiki_arts 74.00 1869 100% 1869 1
wiki_society 126.98 1585 100% 1104 2
wiki_linguistics 103.18 1674 100% 1153 2
wiki_physical_science 54.47 2546 100% 2546 1
wiki_history 60.28 2261 100% 2261 1
early_modern_science 23.92 3977 100% 3977 1
religious_translated 41.23 2279 100% 2279 1
cooking 55.21 1664 100% 1664 1
legal_scotus 254.40 627 100% 495 2
eu_parliament_debates 114.32 1377 100% 934 2
openstax_science 60.26 2899 100% 1895 2
openstax_society 341.44 805 100% 418 2
wpa_life_histories 22.18 3562 100% 3562 1

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.