science

Principle of homonymy

Principle of homonymy is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Principle of homonymy rather than just read about it. In short: In zoology, the principle of homonymy is one of the guiding principles of the International Code of Zoological Nomenclature. It states that any one name, in one particular spelling, may be used only once (within its group).

Key takeaways

Principle of homonymy belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Principle of homonymy to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Principle of homonymy from memory before moving on to harder problems.

Reference excerpt

In zoology, the principle of homonymy is one of the guiding principles of the International Code of Zoological Nomenclature. It states that any one name, in one particular spelling, may be used only once (within its group). Typically, once a name is made available, any later name with the same spelling (a homonym) is prohibited and must be replaced. The principles of priority and the first reviser apply here. For family-group names the termination (which is rank-bound) is not taken into account, nor are grammatically acceptable alternative spellings or terminations of species-group names (e.g., caeruleus and coeruleus are homonyms, as are smithi and smithii).

In 1777 Johann Reinhold Forster published the name Echidna for a genus of moray eels. This meant that when Georges Cuvier proposed to use this name Echidna in 1797 for the spiny anteater he created a junior homonym. Later, in 1811, Johann Karl Wilhelm Illiger published the name Tachyglossus, as a replacement name, or nomen novum, and this is considered to be the valid name for the spiny anteater.

References

Worked examples

Example 1 — a first encounter with Principle of homonymy

Start with the simplest possible case. Write down what Principle of homonymy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Principle of homonymy before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Principle of homonymy ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Principle of homonymy

In research: Principle of homonymy appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Principle of homonymy in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Principle of homonymy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Zoological nomenclature, so understanding it makes those chapters shorter.
In everyday life: Look for Principle of homonymy outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Principle of homonymy” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Principle of homonymy in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Principle of homonymy means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Principle of homonymy out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Principle of homonymy in simple terms?

Why does Principle of homonymy matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Principle of homonymy?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Principle of homonymy.