Plena Ilustrita Vortaro (vortaro.net)
The authoritative Esperanto dictionary — defined in Esperanto, free online.
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What it actually is
The PIV is Esperanto's reference dictionary, defining every word in Esperanto rather than translating it. That monolingual habit is worth forming early in a language this regular: once you can read a definition, you can look up anything without a bilingual crutch. Dense and scholarly.
What it covers
- Vocabulary
- Reading