What does "observed" mean?

simple past and past participle of observe

Observed

Common synonyms include: actual assignment, ascertained, attested, celebrated holiday, commented, comply.

/əbˈzɝvd/ adj, verb

adj, verb ·Moderate ·College level

Verb

1
simple past and past participle of observe form-of, participle, past
"Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich N-substituted pyrroles are much less reactive than the other 5-membered 1,3-dienes; no reaction was observed between N-(trimethylsilyl) pyrrole or N-benzylpyrrole with Smith’s diene (4) under thermal or high pressure (4 days at 14 kbar) conditions, even in the presence of Lewis acids."

Adjective

1
Exceptionally celebrated on a date other than the usual date.
"Sunday, July 1: Canada Day; Monday, July 2: Canada Day observed."

Adjective

"He observed that we should probably have rain coming."