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We present the intensive spectroscopic follow up of the type Ia supernova (SNIa) 2014J in the starburst galaxy M82. Twenty-seven optical spectra have beenacquired from January 22nd to September 1st 2014 with the Isaac Newton (INT)and William Herschel (WHT) Telescopes. After correcting the observations forthe recession velocity of M82 and for Milky Way and host galaxy extinction, wemeasured expansion velocities from spectral line blueshifts andpseudo-equivalent width of the strongest features in the spectra, which givesan idea on how elements are distributed within the ejecta. We position SN 2014Jin the Benetti (2005), Branch et al. (2006) and Wang et al. (2009) diagrams.These diagrams are based on properties of the Si II features and providedynamical and chemical information about the SN ejecta. The nearby SN 2011fe,which showed little evidence for reddening in its host galaxy, is shown as areference for comparisons. SN 2014J is a border-line object between theCore-normal (CN) and Broad-line (BL) groups, which corresponds to anintermediate position between Low Velocity Gradient (LVG) and High VelocityGradient (HVG) objects. SN 2014J follows the R(Si II)-\Delta m15 correlation,which confirms its classification as a relatively normal SN Ia. Our descriptionof the SN Ia in terms of the evolution of the pseudo-equivalent width ofvarious ions as well as the position in the various diagrams put this specificSN Ia into the overall sample of SN Ia.

SN 2014J at M82: I. A middle-class type Ia supernova by all spectroscopic metrics