Vocabulary Lessons Starting with the Letter O

There are a total of 47 vocabulary lessons starting with the letter O.  Select a letter to view all the vocabulary lessons starting with that letter or click on a word to study the lesson.

object(n)(v)objective(n)(adj)obligation(n)
obtain(v)obvious(adj)obviously(adv)
occasion(n)occasionally(adv)occur(v)
odd(adj)offer(v)(n)office(n)
officer(n)official(adj)(n)often(adv)
oil(n)oK(adj,adv)old(adj)
once(adv)only(adv)(adj)open(v)(adj)
opening(n)(adj)operate(v)operation(n)
opinion(n)opportunity(n)opposite(adj)(n)
option(n)orange(n)(adj)order(n)(v)
ordinary(adj)organization(n)organize(v)
organized(adj)original(adj)originally(adv)
other(adj)otherwise(adv)out(adv)
outcome(n)outside(adv)(adj)oven(n)
overall(adj)overcome(v)owe(v)
own(adj)(v)owner(n)