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In literature, meter (sometimes known as prosody) is a term used in the scansion of poetry, usually indicated by the kind of feet and the number of them. For instance, "iambic pentameter", "dactylic tetrameter", etc.
The most important Classical meter is the dactylic hexameter, the meter of Homer and Vergil. This form uses verses of six feet. The first four feet are dactyls, but can be spondees. The fifth foot is always a dactyl. The sixth foot is either a spondee or a trochee. The initial syllable of either foot is called the ictus, the basic "beat" of the verse. There is usually a caesura after the ictus of the third foot. The opening line of the Æneid is a typical line of dactylic hexameter:
The first and second feet are dactyls; their vowels are grammatically short, but long in poetry because both are followed by two consonants. The third and fourth feet are spondees, with two long vowels, one on either side of the caesura. The fifth foot is a dactyl, as it must be, with the ictus this time falling on a grammatically long vowel. The final foot is a spondee with two grammatically long vowels.
The dactylic hexameter was imitated in English by Henry Wadsworth Longfellow in his poem Evangeline:
Also important in Greek and Latin poetry is the dactylic pentameter. This was a line of verse, made up of two equal parts, each of which contains two dactyls followed by a long syllable. Spondees can take the place of the dactyls in the first half, but never in the second. The long syllable at the close of the first half of the verse always ends a word, giving rise to a caesura.
Dactylic pentameter is never used in isolation. Rather, a line of dactylic pentameter follows a line of dactylic hexameter in the elegiac distich or elegiac couplet, a form of verse that was used for the composition of elegies and other tragic and solemn verse in the Greek and Latin world. An example from Ovid's lyric meters, which were typically used for shorter poems than elegiacs or hexameter. One important line was called the hendecasyllabic, a line of eleven syllables. This meter was used most often in the Sapphic stanza, named after the Greek poet Sappho, who wrote many of her poems in the form. A hendecasyllabic is a line with a never-varying structure: two trochees, followed by a dactyl, then two more trochees. In the Sapphic stanza, three hendecasyllabics are followed by an "Adonic" line, made up of a dactyl and a trochee. This is the form of Catullus 51:
The Sapphic stanza was imitated in English by Swinburne in a poem he simply called Sapphics:
The metrical "feet" in the classical languages were based on the length of time taken to pronounce each syllable, which were categorized as either "long" syllables or "short" syllables. The foot is often compared to a musical measure and the long and short syllables to whole notes and half notes. In English poetry, feet are determined by emphasis rather than length, with stressed and unstressed syllables serving the same function as long and short syllables in classical meter.
The basic unit in Greek and Latin prosody is a mora, which is defined as a single short syllable. A long syllable is equivalent to two moras. A long syllable contains either a long vowel, a diphthong, or a short vowel followed by two or more consonants. Various rules of elision sometimes prevent a grammatical syllable from making a full syllable.
Most English meter is classified according to the same system as Classical meter with an important difference: stressed and unstressed syllables take the place of long and short syllables. The most frequently encountered line of English verse is the iambic pentameter, in which the norm is five iambic feet per line, though many kinds of substitution are common. John Milton's Paradise Lost, most sonnets, and much else besides in English are written in iambic pentameter. Stanzas of unrhymed iambic pentameter are commonly known as blank verse. Blank verse in the English language is most famously represented in the plays of William Shakespeare, although it is also notable in the work of Tennyson (e.g. Ulysses, The Princess).
A rhymed pair of lines of iambic pentameter make a heroic couplet, a verse form which was used so often in the eighteenth century that it is now used mostly for humorous effect (although see Pale Fire for a non-trivial case).
Another important meter in English is the ballad meter, also called the "common meter", which is a four line stanza, with two pairs of a line of iambic tetrameter followed by a line of iambic trimeter; the rhymes usually fall on the lines of trimeter, although in many instances the tetrameter also rhymes. This is the meter of most of the Border and Scots or English ballads, and a great many hymns, such as Amazing Grace:
but perhaps the poet who put this form to best use was Emily Dickinson:
Old English poetry has a different metrical system. In Old English poetry, each line must contain four fully stressed syllables, which often alliterate. The unstressed syllables are less important. Old English poetry is an example of the alliterative verse found in most of the older Germanic languages.
In French poetry, meter is determined solely by the number of syllables in a line. A silent 'e' counts as a syllable, except at the end of a line. The most frequently encountered meter in French is a line of six feet called the alexandrine.
In Spanish poetry, meter is determined solely by the number of syllables in a line. Syllables in Spanish metrics are determined by consonant breaks, not word boundaries, so a single syllable may include multiple words. For example, the line De armas y hombres canto consists of 6 syllables: "De ar" "mas" "y hom" "bres" "can" "to."
Some common meters in Spanish verse are:
In Italian poetry, meter is determined solely by the number of syllables in a line. When a word ends with a vowel and the next one starts with a vowel, they are considered to be in the same syllable: so Gli anni e i giorni consists of only four syllables ("Gli an" "ni e i" "gior" "ni"). Moreover, syllables are enumerated with respect to a verse which ends with a paroxytone: an heptasyllable may so contain eight syllables (Ei fu. Siccome immobile) or just six (la terra al nunzio sta).
Some common meters in Italian verse are:
Alexandrine, Dactylic hexameter, Elegiac couplet, Hendecasyllable, Heroic couplet, Iambic pentameter