Glossary: Terms Starting with O
72 definitions with links to the lessons that teach each word.
object
English
a thing you can see or touch
Learn it in: Naming familiar objects (Grade 1), Presenting personal experiences (Grade 1), Sentence structure (Grade 5)
object
Maths
A thing you can see and touch.
Learn it in: Identifying shapes in everyday life (Grade 1), Identifying shapes (Grade 2)
object
Science
a thing that you can see or touch
Learn it in: Identifying objects (Grade 1), What are materials (Grade 1)
object of the preposition
English
the noun that follows the preposition
Learn it in: Prepositional phrases (Grade 4)
objects
Maths
Real things you can touch, like stones or seeds.
Learn it in: Addition using objects (Grade 1)
observation
Science
something you notice using your senses or a tool
Learn it in: Reviewing scientific observation (Grade 2)
observe
Science
to look and use your senses to find out
Learn it in: Using our senses to observe (Grade 1), What is weather (Grade 1), Observing the sky (Grade 1)
obtuse angle
Maths
Bigger than a right angle but less than a straight line.
Learn it in: Introduction to other angles (Grade 3)
odd
Maths
Has one left over when put in pairs.
Learn it in: Odd and even numbers (Grade 2), Prime numbers (Grade 4)
off-topic
English
not connected to what we are talking about
Learn it in: Asking relevant questions (Grade 2), Central ideas (Grade 6)
omniscient
English
knowing all characters’ thoughts
Learn it in: Narrative perspective (Grade 5), Point of view (Grade 6)
once living
Science
alive before, but not alive now
Learn it in: Living and non-living things (Grade 1)
one-to-one
Maths
Saying one number for each object, once.
Learn it in: Counting objects from 0–10 (Grade 1)
ones
Maths
Single things. The ones digit shows how many.
Learn it in: Tens and ones (Grade 1), Grouping objects into tens (Grade 1), Understanding ones (Grade 1)
onomatopoeia
English
a word that sounds like the sound it names
Learn it in: Onomatopoeia (Grade 3), Figurative language (Grade 5), Literary devices (Grade 6)
open question
English
a question needing more than yes or no
Learn it in: Research questions (Grade 2), Research questions (Grade 3), Research questions (Grade 4)
open syllable
English
a syllable that ends in a vowel, with a long vowel
Learn it in: Syllable patterns (Grade 3)
operation
Maths
Adding or subtracting.
Learn it in: Two-step word problems (Grade 2), Multistep problems (Grade 4), Numerical expressions (Grade 5)
opinion
English
what someone thinks
Learn it in: Gathering simple facts (Grade 1), Expressing opinions (Grade 2), Responding to literature (Grade 2)
opposite
English
a word with a very different meaning
opposite
Maths
Does the reverse.
Learn it in: Relationship between addition and subtraction (Grade 1), Introduction to integers (Grade 6), Positive and negative numbers (Grade 6)
order
English
which comes first, next and last
Learn it in: Following simple instructions (Grade 1), Reading connected texts (Grade 1), Understanding story events (Grade 1)
order
Maths
Putting things one after another in a rule.
Learn it in: Ordering numbers (Grade 1), Ordering numbers (Grade 1), Comparing lengths (Grade 1)
order of importance
English
arranging points from most to least important, or the reverse
Learn it in: Supporting reasons (Grade 6)
order of operations
Maths
Rules for the sequence of steps.
Learn it in: Order of operations (Grade 5), Order of operations (Grade 5), Evaluating expressions (Grade 6)
ordered pair
Maths
(x, y).
Learn it in: Plotting points (Grade 5), Plotting points in four quadrants (Grade 6)
organise
English
put in order
Learn it in: Organising ideas (Grade 2), Paragraph organisation (Grade 3)
original
English
new and made by you
Learn it in: Similes (Grade 3), Primary and secondary sources (Grade 4), Paraphrasing (Grade 5)
outlier
Maths
Far-out value.
Learn it in: Dot plots (Grade 6), Range (Grade 6), Interpreting distributions (Grade 6)
outline
English
a plan listing headings and facts
Learn it in: Organising findings (Grade 3), Organising research (Grade 4)
output
Maths
What comes out.
Learn it in: Rules and relationships (Grade 5), Number relationships (Grade 6)
overgeneralisation
English
claiming too much from too little
Learn it in: Evaluating conclusions (Grade 6)
own words
English
not the exact words
Learn it in: Retelling stories (Grade 1), Retelling information orally (Grade 2), Summarising short texts (Grade 2)