Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
1870s is a noun meaning "the decade from 1870 to 1879". It carries one recorded sense.
the decade from 1870 to 1879
Definitions, synonyms and semantic relations for 1870s come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.