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: 1517 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr A1 (1 of 6) 800

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 61.18 1133 50% 1500 downrated 2
20th_books 58.16 1340 50% 1590 downrated 2
wiki_math 0.00 — — — 0
wiki_geography 163.85 670 50% 796 downrated 2
wiki_biology 13.17 4445 50% 8890 downrated 1
wiki_modern_life 59.90 2251 50% 2468 downrated 2
wiki_arts 101.75 1009 50% 1331 downrated 2
wiki_society 85.15 1464 50% 1659 downrated 2
wiki_linguistics 12.09 4011 50% 8022 downrated 1
wiki_physical_science 0.00 — — — 0
wiki_history 107.62 1076 50% 1221 downrated 2
early_modern_science 31.70 1808 50% 3616 downrated 1
religious_translated 23.42 3330 50% 3601 downrated 2
cooking 45.07 1223 50% 2446 downrated 1
legal_scotus 297.91 259 50% 387 downrated 3
eu_parliament_debates 169.19 556 50% 721 downrated 2
openstax_science 42.39 2377 50% 2924 downrated 2
openstax_society 89.49 1214 50% 1564 downrated 2
wpa_life_histories 41.90 2066 50% 2166 downrated 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.