  PSR~J1618$-$3921 is an $11.99$-ms pulsar in a $22.7$-d orbit around a likely
low-mass He white dwarf companion, discovered in a survey of the intermediate
Galactic latitudes at 1400 MHz conducted with the Parkes radio telescope in the
late 1990s. Although PSR~J1618$-$3921 was discovered more than 15 years ago,
only limited information has been published about this pulsar which has a
surprisingly large orbital eccentricity ($e \simeq 0.027$), considering its
high spin frequency and likely small companion mass. The focus of this work is
a precise measurement of the spin, astrometric and orbital characteristics of
PSR J1618$-$3921. This was done with timing observations made at the Nan\c{c}ay
Radio Telescope, from 2009 to 2017. We analyzed the timing data recorded at the
Nan\c{c}ay Radio Telescope over several years to characterize the properties of
PSR~J1618$-$3921. A rotation ephemeris for this pulsar was obtained by
analyzing the times of arrival of the radio pulses at the telescope. We confirm
the unusual eccentricity of PSR~J1618$-$3921 and discuss several hypotheses
regarding its formation, in the context of other discoveries of recycled
pulsars in eccentric orbits.

High Energy Astrophysical Phenomena;Solar and Stellar Astrophysics