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2 [ count ] something that you say or write He made an observation about the weather.

—SYNONYM comment

ob • serve / эЬ ' zэrv / verb

( ob • serves , ob serv • ing , ob • served )

( formal )

to watch or see someone or something The police observed a man leaving the house.

ob • serv • er / эЬ ' zэrvэr / noun [ count ] a person who watches someone or something According to observers, the fire started around midnight.

ob • sess / эЬ ' ses / verb ( ob • sess • es , ob sess ing , ob • sessed )

to completely fill your mind Don is obsessed with football.

ob • ses • sion / эЬ ' sejn / noun [ count ]

a person or thing that you think about all the time Cars are his obsession.

ob • sta • cle / ' abstэkl / noun [ count ]

something that makes it difficult for you to do something or go somewhere

Not speaking a foreign language was a major obstacle to her career.

ob • sti • nate / ' аbstэnэt / adjective

not changing your ideas; not doing what other people want you to do

He's too obstinate to say he's sorry. —SYNONYM stubborn

ob • struct / эЬ ' stmkt / verb ( ob • structs , ob • struct • ing , ob • struct • ed )

to be in the way, so that someone or something cannot go past

Please move your car — you're obstructing traffic.

ob • struc • tion / эЬ ' st^k/n / noun [ count ]

a thing that stops someone or something from going past The train had to stop because there was an obstruction on the tracks.

ob .tain © / sb'tein / verb{ ib tains, ob • tain • ing , ob • tained )

( formal )

to get something to obtain permission

ob • tuse an • gle / ab' tus |®ggl / noun [count]

( MATH ) an angle of more than 90° but less than 180° —Look at the picture at angle .

Ob .Vi .OUS © / 'abviss/ adjective

easy to see or understand

It's obvious that she's not happy.

^SYNONYM clear

ob • vi • ous • lyAWL / ' ab^sH / adverb There has obviously been a mistake.

ОС .ca .sion © / э'ке^п/ noun [ count ]

a time when something happens

I've been to Chicago on three or four occasions .

a special time

A wedding is a big family occasion.

oc • ca • sion • al / э ' ke^nl /

happening sometimes, but not very often We get the occasional visitor.

oc • ca • sion • al • ly / э ' ke^^li / adverb

sometimes, but not often I go to Miami occasionally.

oc • cu • pantAWL / ' аkyэpэnt / noun [ count ] ( formal )

a person who lives or works in a particular room, house, or building

The fire destroyed the building, but all the occupants escaped safely.

oc • cu • pa • tion AWL / ^уэ' peijn / noun

[count] ( formal )

a job

What is your mother's occupation?

[ noncount ] when a country or army takes or has control of an area or building

oc • cu • py AWL / ' аkyэpaI / verb ( oc • cu • pies , oc • cu • py • ing , oc cu • pied , has oc • cu • pied )

to fill a space or period of time

The bed seemed to occupy most of the room.

—SYNONYM take up

( formal ) to live or work in a room or building

The house next door has not been occupied for months.

—Look at occupant .

to keep someone busy She occupied herself reading.

to take or have control of an area or building Protestors occupied the TV station.

► oc • cu • pied AWLl / ' akyэpaId / adjective