A theory of truth or knowledge; the idea that that which is symmetrically consistent, internally consistent, and eternally adequate to the facts is true.

The underlying logical connectedness of a text, whereby concepts and relationships are relevant to each other and where it is possible to make plausible inferences about underlying meaning.

A characteristic of effective writing, achieved through careful organization of ideas and the skillful use of transitions.

is the manner in which an essay "holds together" its main ideas. A coherent theme will demonstrate such a clear relationship between its thesis and its logical structure that readers can easily follow the argument. Colloquial expressions

logically connected sense that holds parts of a text together

The connection of the components of an essay to each other and to the essay's thesis. In a coherent essay the words, sentences ,and paragraphs are connected to one another and to the essay's thesis so logically and naturally that readers feel they are seeing a single idea unfold instead of struggling with a patchwork of ideas loosely pasted together. Like the pieces of a jigsaw puzzle, each word, sentence, and paragraph must seem to be the only one that fits (one that almost fits isn't good enough). Coherence is created by being aware that readers need clear transitions that connect the pieces of the puzzle together. If you want your essay to be coherent: (a) repeat key words to help your readers keep track of where you have been and where you are headed (but don't say anything twice), (b) use pronouns that clearly refer to specific nouns, (c) use dependent and independent clauses instead of always connecting ideas with “and,” and (d) use parallel sentence structure (e.g., say he “eats, works, and sleeps” instead of he “eats, is working, and sleeps”).

is the connecting of ideas together through devices such as transitional phrases, and repetition of key word/phrases and consistent use of pronouns.

the condition that the phase difference between waves is constant in time and space (see figure 24.10)

Characterized in light forms as a consistent fixed relationship between points on the wave.

Refers to the phase stability of two wavetrains, from the same optical wave, separated in time.

the act of maintaining a constant phase relationship between oscillating waves or rotating objects.

A term describing light as waves which are in phase in both time and space. Monochromaticity and low divergence are two properties of coherent light.

In listening, it describes a kind of perceptual realism in sounds. In measurements, it is a measure of the correlation between the phases of two or more signals.

Coherence can be devided into spatial and temporal coherence. For any em wave, if at time t=0 and t0 the phase diference between two points in space remains the same, we say the em wave has spatial coherence; If at a point P, the em wave at t and t+dt has same phase difference if dt is the same, temporal coherence exists.

The property of being coherent, e.g. waves having similar direction, amplitude and phase that are capable of exhibiting interference.

the degree to which separate parts of the electron wave have defined phase relationships, and are able to interfere with each other in the image formation process. There exists a gradation from full coherence (all parts of the wave have defined phase relationships) over partial coherence (intermediate situation) to incoherence (no defined phase relationships). In bright field electron microscopy, the contrast transfer function is normally given for the fully coherent situation, and the influence of partial coherence is expressed by an envelope function.

A measure of the similarity of two oscillating functions.

A definite phase relationship between two energy waves, such as transmitted frequency and reference frequency.

Coherence is the property of wave-like states that enables them to exhibit interference. It is also the parameter that quantifies the quality of the interference (also known as the degree of coherence). It was originally introduced in connection with Young’s double-slit experiment in optics but is now used in any field that involves waves, such as acoustics, electrical engineering, neuroscience, and quantum physics.

Coherence in linguistics is what makes a text semantically meaningful. It is especially dealt with in text linguistics. Coherence is achieved through syntactical features such as the use of deictic, anaphoric and cataphoric elements or a logical tense structure, as well as presuppositions and implications connected to general world knowledge.