"observing" in the verb sense
1. detect, observe, find, discover, notice
discover or determine the existence, presence, or fact of
"She detected high levels of lead in her drinking water"
"We found traces of lead in the paint"
2. note, observe, mention, remark
make mention of
"She observed that his presentation took up too much time"
"They noted that it was a fine day to go sailing"
3. note, take note, observe
observe with care or pay close attention to
"Take note of this chemical reaction"
4. observe
watch attentively
"Please observe the reaction of these two chemicals"
5. respect, honor, honour, abide by, observe
show respect towards
"honor your parents!"
6. observe, celebrate, keep
behave as expected during of holidays or rites
"Keep the commandments"
"celebrate Christmas"
"Observe Yom Kippur"
7. watch, observe, follow, watch over, keep an eye on
follow with the eyes or the mind
"Keep an eye on the baby, please!"
"The world is watching Sarajevo"
"She followed the men with the binoculars"
8. observe, keep, maintain
stick to correctly or closely
"The pianist kept time with the metronome"
"keep count"
"I cannot keep track of all my employees"
9. observe, keep
conform one's action or practice to
"keep appointments"
"she never keeps her promises"
"We kept to the original conditions of the contract"
"observing" in the adjective sense
1. observant, observing
quick to notice showing quick and keen perception
Source: WordNet® (An amazing lexical database of English)
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