Base Difficulty

Base difficulty: Level 275 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: 908 (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 117.09 1105 100% 779 2
20th_books 156.91 886 100% 605 2
wiki_math 60.05 2516 100% 1409 2
wiki_geography 169.43 1229 100% 817 2
wiki_biology 120.87 1866 100% 1125 2
wiki_modern_life 141.27 1911 100% 1044 2
wiki_arts 129.18 2067 100% 1079 2
wiki_society 199.84 1315 100% 708 2
wiki_linguistics 146.18 1606 100% 873 2
wiki_physical_science 85.59 2658 100% 1540 2
wiki_history 252.34 926 100% 524 2
early_modern_science 72.90 2903 100% 1452 2
religious_translated 44.13 3128 100% 1872 2
cooking 0.00 — — — 0
legal_scotus 220.20 1145 100% 594 2
eu_parliament_debates 491.68 372 100% 248 2
openstax_science 102.65 2052 100% 1249 2
openstax_society 438.99 523 100% 313 2
wpa_life_histories 56.47 2673 100% 1482 2

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.