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27.

The Base is that part of a word which is unchanged in inflection: as, serv- in servus; mens- in mensa; ígn- in ígnis.

a. The Base and the Stem are often identical, as in many consonant stems of nouns (as, reg- in reg-is). If, however, the stem ends in a vowel, the latter does not appear in the base, but is variously combined with the inflectional termination. Thus the stem of servus is servo-; that of ménsa, ménsá-; that of ígnis, ígni-.