B. Foundations of Language · Foundations of Language: Listening, Speaking, Words, Fluency and Conventions

Greek and Latin Roots for High School: Make, Stand, Drive, Speak, Roll, Loosen, Place and More

B2.2 B2.1 A3.1About 65 minutes

Learning goals

I can recognize nine Latin roots and seven Greek roots that appear in high school subjects.
I can use a root, along with prefixes and suffixes, to figure out the meaning of an unfamiliar word.
I can read and spell words in a root family with accuracy.
I can explain the meaning of academic words like analysis, hypothesis and synthesis from their parts.

Words to know

root
A base from another language, often Latin or Greek, that carries the core meaning of many English words.

etymology
The history of a word: where it came from and how its meaning changed.

hypothesis
A testable prediction or explanation: an idea "placed under" testing.

analysis
Breaking something into parts to understand how it works.

synthesis
Putting ideas or parts together to make something new or a combined understanding.

ecosystem
A community of living things interacting with each other and their non-living environment.

eloquent
Speaking or writing in a fluent, powerful, persuasive way.

Remember from earlier grades

You've built a big root collection: port, struct, spect, dict (Grade 4); duc, ject, mit, chron, hydr (Grade 5); vert, spir, ten, ced/cess, morph, gen (Grade 6); cogn, sequ, clud, jud, anthrop, polit (Grade 7); and cred, ver, fer, pos, grad/gress, flect, junct, migr, flu, lingu (Grade 8). This lesson adds roots that are especially common in Grade 9 courses: science, mathematics, geography and English.

Let's start with a puzzle

In the same week, a Grade 9 student might read:

"Write a hypothesis for your investigation." (science)
"Complete an analysis of the main character." (English)
"How has urban growth affected the local ecosystem?" (geography)
"Explain how the isotopes of carbon differ." (science)

If you know a few Greek parts (hypo, thesis, ana, lysis, eco, iso), these words stop being mysterious. Roots are like a master key for academic vocabulary.

Latin root	Means	Examples
fac, fact, fect, fic	make, do	factory, manufacture, effect, efficient, sufficient, artifact
sist, stat, stit	stand	resist, consist, status, constitution, institution, substitute
pel, puls	drive, push	propel, expel, compel, repel, impulse, compulsory
tort	twist	distort, contort, retort, torque
loqu, locu	speak	eloquent, colloquial, soliloquy, circumlocution
volv, volu	roll, turn	revolve, evolve, involve, revolution, evolution
solv, solu	loosen	solve, dissolve, solution, solvent, soluble, resolution
sed, sid, sess	sit, settle	sediment, sedentary, preside, residue, session
mut	change	mutation, mutant, commute, immutable

Nine Latin roots. Notice how many science words are here: sediment, solution, solvent, mutation, propel.

Greek root	Means	Examples
the, thes	put, place	thesis, hypothesis, synthesis, parenthesis
lys, lyt	loosen, break apart	analysis, analyze, catalyst, electrolysis
eco (from oikos)	house, household	ecology, ecosystem, economy
iso	equal	isotope, isosceles, isobar
chrom	colour	chromosome, monochrome, chromatic
kine, kinet, cine	movement	kinetic, kinesiology, cinema
tox	poison	toxic, toxin, toxicology, detox

Seven Greek roots common in science and in academic tasks.

A root family. Each word contains the idea of making or doing: a factory makes things, an effect is what something does, an efficient machine does a lot with little waste.

Meaning moves

Roots give you the core idea, but meanings stretch over time. Use the root as a clue, then check it against the context.

Revolve (roll again) → turn in a circle. Revolution → a complete turn, and also a sudden, complete change in government or society: a society turning over.
Economy comes from Greek words for household management. Today it means how a whole country or region manages money, goods and services.
Sedentary (from sit) describes a lifestyle with lots of sitting and little physical activity, a word you'll meet in Health and Physical Education.
Colloquial (from speak) means informal, conversational language: "gonna" is colloquial.

Three academic words built from Greek parts. Once you know thesis means a placing, you can see why a thesis in an essay is the main idea you put forward.

Worked example

Let's figure out a word from its root

A science article says: "Mercury is toxic, so old thermometers must be disposed of safely; they should never be thrown in the garbage." A geography article says: "Rivers deposit sediment where they slow down and enter a lake." Use roots to explain toxic and sediment.

toxic: root tox = poison; suffix -ic = having the quality of. So toxic = poisonous.
Check context: "must be disposed of safely; never thrown in the garbage" supports a meaning of harmful or poisonous. ✓
sediment: root sed = sit, settle; suffix -ment = a thing that results. So sediment = material that settles.
Check context: "rivers deposit sediment where they slow down" fits: when water slows, sand and soil settle to the bottom. ✓

toxic = poisonous (tox + -ic); sediment = material that settles to the bottom (sed + -ment). Both meanings fit the context.

Root + context, not root alone

A root gets you close; context gets you exact. Compel (drive together) doesn't mean "push people into a group"; in context it means force someone to do something: "The storm compelled us to turn back."

Hands-on activity

Root hunt across your courses

You need: paper, a pen, and your textbooks or class notes from at least two different courses (or a newspaper).

Make a chart with three columns: Word, Root and meaning, Meaning in context.
Hunt for at least 8 words that contain a root from today's tables. Try science and geography first.
For each word, write the sentence it appeared in, then explain how the root helps (and where the meaning has stretched).
Pick your two favourite roots. Write as many words from each family as you can in 3 minutes. Check them in a dictionary.

Just for fun

Toxic comes from the Greek word toxon, meaning "bow" (as in bow and arrow). The Greeks used toxikon for poison put on arrow tips. So every time someone calls something "toxic," they are, word-wise, talking about archery.

Your turn

Use the root to explain propel.

What does iso mean, and what does an isosceles triangle have?

Which root do dissolve, solution and soluble share, and what does it mean?

What is a soliloquy in a play? Use the root.

Explain why the word thesis fits its job in an essay.

Which word means "twisted out of shape": distorted, dissolved or distracted?

What does kinetic energy mean, using the root?

More practice: warm-up

What does the root chrom mean?

What does mut mean?

Name a word with the root stat or sist.

Which root means "sit" or "settle"?

What does eco come from?

More practice: on your own

A history text says the town council "held a session to resolve the dispute." Use roots to explain session and resolve.

Explain how a catalyst in chemistry and a "catalyst for change" in history share a meaning.

Why might immutable be used to describe a law of nature?

Sort these into the correct root families: efficient, compulsory, evolve, artifact, impulse, involve.

Explain why colloquial language may not suit a formal lab report.

Challenge

The word constitution contains stit (stand). Explain how a country's constitution is something that "stands".

Create a new, made-up word from roots in this lesson and define it (for example, tox + -phobia). Then explain why the meaning is clear.

Use the root volv/volu to connect revolve, evolution and volume (a book). Explain the link.

Check your understanding

Quiz

The root in efficient, factory and effect means:

A hypothesis is literally:

Which root means poison?

Sediment contains a root meaning:

Which word means "a speech given by a character alone on stage"?

Analysis is made of Greek parts meaning:

For parents and teachers

Big idea: B2.2 asks students to acquire and use vocabulary flexibly in various contexts, including other subject areas, and to use morphological knowledge to analyze new words. Roots are among the most useful tools for academic words.

How to help at home: Pick a "root of the week" and look for it in the news, on packaging or in your teen's homework (toxic on a cleaning label, eco- on a product). Ask, "What does the root tell you?"

Common difficulties:

Trusting the root over the context: roots give the core idea, but meanings stretch.
Look-alike letters that aren't roots: sed in used is not the root sed. The part must carry meaning.
Spelling root variants: fac/fect/fic, sist/stat/stit. Learning them as families helps.