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: 140 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 54.99 1996 100% 1513 2
20th_books 81.40 1355 100% 1105 2
wiki_math 2156.17 81 100% 56 2
wiki_geography 932.95 130 100% 112 2
wiki_biology 1025.77 120 100% 100 2
wiki_modern_life 2098.39 72 100% 40 2
wiki_arts 439.39 315 100% 255 2
wiki_society 1138.21 116 100% 82 2
wiki_linguistics 1751.45 86 100% 63 2
wiki_physical_science 1983.22 65 100% 47 2
wiki_history 530.10 236 100% 202 2
early_modern_science 349.69 367 100% 312 2
religious_translated 22.45 3734 100% 3734 1
cooking 0.00 — — — 0
legal_scotus 478.44 285 100% 247 2
eu_parliament_debates 944.48 179 100% 133 2
openstax_science 2587.52 52 100% 37 3
openstax_society 1212.82 116 100% 88 2
wpa_life_histories 83.36 1257 100% 1115 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.