say it: TAN-duhm
tandem is a noun and adverb meaning "an arrangement of two or more objects or persons one behind another". It carries 3 recorded senses.
one behind the other
“ride tandem on a bicycle built for two”
“riding horses down the path in tandem”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for tandem come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.