Quick answer
Conjetura is a proposed inference from incomplete signs; especulação ranges more freely beyond confirmed evidence and also has a financial sense.
A reliable test is to identify the job of the word before translating from English.
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What each word does
conjetura
conjecture
Use conjetura for a reasoned possibility built from incomplete signs or evidence.
especulação
speculation
Use especulação for exploration beyond confirmed evidence, or financial trading based on expected price changes.
How to choose
- conjetura: Choose conjetura if the sentence points to a reasoned possibility built from incomplete signs or evidence.
- especulação: Choose especulação if the sentence points to exploration beyond confirmed evidence, or financial trading based on expected price changes.
Examples
A explicação ainda é uma conjetura.
The explanation is still a conjecture.
A notícia gerou especulação sobre a venda da empresa.
The news generated speculation about the sale of the company.
Common trap
Neither word means proven fact. Conjetura often sounds like one candidate explanation; especulação can name a wider cloud of possibilities.
Practice it in context
Pick one sentence from your real life and write it twice: once with conjetura, then once with especulação. If both versions feel possible, name the meaning shift.
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