Gender & Number Agreement — I can use basic gender and number agreement with common adjectives in simple phrases at my level.

Historical Context & Motivation

If you've ever studied Spanish or French, you know that adjectives sometimes change form depending on the noun they describe. Greek takes this concept even further. Modern Greek inherited a rich system of grammatical gender and number agreement from Ancient Greek, one of the oldest documented Indo-European languages. Understanding why Greek works this way helps you see that agreement isn't random — it's a system that evolved over thousands of years to keep meaning clear and precise.

So why does agreement matter for you as a language learner? Without it, your sentences would sound jumbled and confusing to a native speaker — like saying "the tall books is red" in English. Agreement is the glue that holds Greek phrases together. The core question this lesson addresses is: How do I change an adjective's ending so it correctly matches the gender and number of the noun it describes?

Core Principles of Gender & Number Agreement

Before diving into specific endings, you need to understand a few foundational ideas about how Greek handles adjectives. These principles will guide every adjective choice you make.

Visualizing the Agreement System

The following diagram maps out how a single adjective — καλός (good) — changes its ending across all six possible combinations of gender and number. Notice how the stem καλ- stays the same while the ending shifts.

Notice the pattern: the stem καλ- never changes. Only the ending shifts to signal gender (masculine, feminine, or neuter) and number (singular or plural). This is the heart of Greek agreement. Once you learn these six endings for one adjective, you can apply the same pattern to dozens of common adjectives like μεγάλος (big), μικρός (small), ωραίος (beautiful), and νέος (new).

How Agreement Works Step by Step

Greek adjective agreement follows a predictable process. Every time you want to describe a noun with an adjective, you run through the same mental checklist. Let's break it down into a clear procedure.

The Agreement Process

1. Step 1 — Identify the noun. Look at the noun you want to describe. What is it? For example: σπίτι (house).
2. Step 2 — Check the article. The article tells you the gender. Το σπίτι → "το" = neuter.
3. Step 3 — Determine the number. Is it one house (singular) or many houses (plural)? Το σπίτι = singular.
4. Step 4 — Apply the matching ending. Neuter singular → ending -ο. So "big house" = το μεγάλ-ο σπίτι.

The -ος / -η / -ο Adjective Pattern

The most common adjective type in Greek is the -ος / -η / -ο pattern. The dictionary form always ends in -ος (masculine singular). You then swap the ending based on gender and number. Here is the complete ending chart.

Common Adjectives & Their Forms

Now let's see the agreement system in action with the adjectives you'll use most often in everyday Greek conversation. The table below lists ten high-frequency adjectives with all six forms. These adjectives all follow the same -ος / -η / -ο pattern, which means once you internalize this pattern, you can handle all of them.

Worked Example: Building Agreeing Phrases

Let's walk through a complete example. Suppose you want to say "the small cats" in Greek. The word for cat is γάτα and the adjective for small is μικρός. How do you put them together correctly?

Let's do one more quick example. To say "the big book" (book = βιβλίο, article = το, so neuter singular), you take μεγάλος → stem μεγάλ- → neuter singular ending -ο → το μεγάλο βιβλίο. The process is always the same: identify gender and number, then match the ending.

Common Mistakes & How to Avoid Them

Even after learning the rules, learners frequently make a few predictable errors. Understanding these pitfalls now will save you a lot of frustration later. The table below compares common incorrect forms with their correct versions and explains why the mistake happens.

Connection to More Advanced Greek Grammar

The gender and number agreement you've learned here is the foundation for much more complex structures in Greek. As you progress, you'll encounter case agreement (adjectives also change based on the grammatical role of the noun in a sentence), irregular adjectives (not all adjectives follow the -ος / -η / -ο pattern), and predicate agreement (adjectives that aren't right next to the noun but still must agree with it). The table below previews how this lesson connects to what comes next.

Don't feel overwhelmed by what's ahead. The skill you're building now — matching adjective endings to noun gender and number — is the same skill you'll use in every future Greek grammar topic. Master this pattern, and you'll have a solid toolkit for tackling cases, irregular forms, and complex sentences down the road.

Practice Problems

Test your understanding of gender and number agreement with these five problems. Each one builds on the principles and patterns covered in this lesson. Try to work through each problem before reading the answer.

Lesson Summary