often - často
BrE
/'ɒfn/
AmE
/'ɑ:fn/

adverb - many times, reperatedly, in short intervals

o'clock
o'clock - hodin (při udání času)
BrE
/ə'klɒk/
AmE
/ə'klɑ:k/

noun - the word indicating time when you tell someone what the time is

office
office - kancelář, úřad
BrE
/'ɒfɪs/
AmE
/'ɑ:fɪs/

noun - a place where people work, usually jobs connected with working with computers, documents etc.

open
open - otevřít
BrE
/'əʊpən/
AmE
/'oʊpən/

verb - to do an activity in order that something doesn't stay shut or closed

 
our - náš, naše
BrE
/'aʊə/
AmE
/'aʊər/

determiner - belonging to us

on
on - na
BrE
/'ɒn/
AmE
/'ɑ:n/

preposition - a preposition that expresses that something is in contact with the surface of something, attached to something, in contact with something, lying on something etc.

 
oh - nula
BrE
/'əʊ/
AmE
/'oʊ/

noun - 0

opener
opener - otvírák
BrE
/'əʊpənə/
AmE
/'oʊpənər/

noun - a tool for opening bottles and/or tins etc.

oblong
oblong - pravoúhlý, obdélníkový, obdélný
BrE
/'ɒblɒŋ/
AmE
/'ɑ:blɑ:ŋ/

adjective - having right angles, similar to a square, but with two sides shorter, and two longer

October
October - říjen
BrE
/ɒk'təʊbə/
AmE
/ɑ:k'toʊbər/

noun - the second autumn month

oven
oven - trouba
BrE
/'ʌvn/
AmE
/'ʌvn/

noun - a kitchen appliance in which you can bake or roast etc.

orange
orange - pomeranč
BrE
/'ɒrɪndʒ/
AmE
/'ɑ:rɪndʒ/

noun - a kind of fruit similar to a tangerine, it has a thick orange skin and juicy inside

onion
onion - cibule
BrE
/'ʌnjən/
AmE
/'ʌnjən/

noun - a kind of vegetable with many layers, it is used in cooking and has a very strong smell, which often makes people cry

oil
oil - olej
BrE
/'ɔɪl/
AmE
/'ɔɪl/

noun - a kind of greasy liquid that comes from a variety of plants, such as sunflower or olives, which is used for frying etc.

obstinate
obstinate - tvrdohlavý, umíněný
BrE
/'ɒbstɪnət/
AmE
/'ɑ:bstɪnət/

adjective - refusing to change opinion or decisions, not willing to do what people want