In poetry, syllabic meter is characterized by

a) having a fixed number of syllables per line
b) having stressed syllables at regular intervals
c) having pronounced pauses between syllables
d) having two half-lines of six syllables per verse

In poetry, a syllabic meter is characterized by A. having a fixed number of syllables per line.
So, if we're talking about a pentameter, which is a type of a syllabic meter, it always has to have 10 syllables in each line. An unchanging number of syllables in line is important when it comes to a syllabic meter because it contributes to the rhythm of the poem, whereas stress and pronunciation are not as important here.

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