This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To be or become aware of, especially through careful and directed attention; notice.

v. To watch attentively: observe a child's behavior.

v. To make a systematic or scientific observation of: observe the orbit of the moon.

v. To say casually; remark.

v. To adhere to or abide by: observe the terms of a contract.

v. To keep or celebrate (a holiday, for example): observe an anniversary.

verb-intransitive. To take notice.

verb-intransitive. To say something; make a comment or remark.

verb-intransitive. To watch or be present without participating actively: We were invited to the conference solely to observe.

v. To notice or view, especially carefully or with attention to detail.

v. To follow the custom, practice, or rules (especially of a religion.)

v. To comment on something; to make an observation.

v. To obey a law, rule or custom; comply with.

v. To take notice of by appropriate conduct; to conform one's action or practice to; to keep; to heed; to obey; to comply with

v. To be on the watch respecting; to pay attention to; to notice with care; to see; to perceive; to notice; to discover

v. To express as what has been noticed; to utter as a remark; to say in a casual or incidental way; to remark.

verb-intransitive. To take notice; to give attention to what one sees or hears; to attend.

verb-intransitive. To make a remark; to comment; to make an observation{3}; -- generally with on or upon.

To regard with attention or careful scrutiny, as for the purpose of discovering and noting something; watch; take note of: as, to observe trifles with interest; to observe one's every movement.

Specifically To subject to systematic inspection and scrutiny for some scientific or practical purpose: as, to observe natural phenomena for the purpose of ascertaining their laws; to observe meteorological indications for the purpose of forecasting the weather. See observation, 3.

To see; perceive; notice; remark; hence, to detect; discover: as, we observed a stranger approaching; to observe one's uneasiness.

To notice and remark, or remark upon; refer to in words; say; mention: as, what did you observe?

To heed; regard; hence, to regard with respect and deference; treat with respectful attention or consideration; humor.

To adhere to and carry out in practice; conform to or comply with; obey: as, to observe the regulations of society; to observe the proprieties.

To keep with due ceremonies; celebrate: as, to observe a holiday; to observe the sabbath.

Synonyms To eye, survey, scrutinize.

Notice, Behold, etc. (see see).

Keep, etc. (see celebrate), regard, fulfil, conform to.

To be attentive; take note.

To remark; comment: generally with upon or on.

v. observe with care or pay close attention to

v. watch attentively

v. show respect towards

v. conform one's action or practice to

v. follow with the eyes or the mind

v. stick to correctly or closely

v. make mention of

v. discover or determine the existence, presence, or fact of

v. behave as expected during of holidays or rites

"You are now on the second speed, which you will no doubt observe is considerably faster than the lower speed … Remember that with a motor-car the driver controls the vehicle, and in this it differs from a horse-drawn vehicle, in which the driver is often at the mercy of the animal, to be pulled here, backed there, or upset altogether, should this chance to please the noble quadruped."

observed    observes    observing   

notice    comment   

make good    solemnize    mark    mourn    commemorate    solemnise   

observation    observance    observational    observatory    observant    observer   

see    perceive    notice    discover    remark    attend    comment    celebrate   

Merv    conserve    curve    deserve    mirv    nerve    oeuvre    preserve    reserve    serv   

discussion    vectoring    significant    week-end    instructions.'    gate    kid    connected    thoughts.'    victim