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Magnetic excitations in the spin chain candidate Sr$_2$V$_3$O$_9$ have beeninvestigated by inelastic neutron scattering on a single crystal sample. Aspinon continuum with a bandwidth of $\sim22$ meV is observed along the chainformed by alternating magnetic V$^{4+}$ and nonmagnetic V$^{5+}$ ions.Incipient magnetic Bragg peaks due to weak ferromagnetic interchain couplingsemerge when approaching the magnetic transition at $T_N\sim 5.3$ K while theexcitations remain gapless within the instrumental resolution. Comparisons tothe Bethe ansatz, density matrix renormalization group (DMRG) calculations, andeffective field theories confirm Sr$_2$V$_3$O$_9$ as a host of weakly coupled$S = 1/2$ chains dominated by antiferromagnetic intrachain interactions of$\sim7.1$(1) meV.

Spinon continuum in the Heisenberg quantum chain compound Sr$_2$V$_3$O$_9$