extended (adj.)youdaoicibaDictYouDict[extended 词源字典]
mid-15c., "occupying time, made longer," past participle adjective from extend (v.). Meaning "stretched out" in space is from 1550s; extended-play (adj.), in reference to recordings (especially 7-inch, 45 rpm vinyl records) is from 1953; in reference to pinball games by 1943. Extended family (n.) in sociology recorded from 1942.
A challenging question was asked RCA engineers and scientists in 1951. How can we increase the playing time of a 7-inch record, without using a larger disc? Sixteen months of research gave the answer, "45 EP"--Extended Play. [Radio Corporation of America magazine advertisement, May 1953]
[extended etymology, extended origin, 英语词源]
pretended (adj.)youdaoicibaDictYouDict
mid-15c., "so-called," past participle adjective from pretend (v.).
unattended (adj.)youdaoicibaDictYouDict
c. 1600, "alone, unaccompanied," from un- (1) "not" + past participle of attend (v.). Meaning "with no one in attendance" is from 1796.
unintended (adj.)youdaoicibaDictYouDict
1640s, from un- (1) "not" + past participle of intend (v.).