noun, noun or participle which takes 'suru', transitive verb, noun which may take the genitive case particle 'no'
guess; conjecture; speculation
Used for forming an opinion or conclusion based on incomplete information. Common in both noun and する-verb forms, as well as adjectival 推測の.
彼の推測は当たっていた。
His guess turned out to be correct.
警
The police are speculating about the suspect's motive.
これはあくまで推測の域を出ない。
This is still just speculation.