Etymology
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impress (v.1)

late 14c., "have a strong effect on the mind or heart, to stamp deeply in the mind," from Latin impressus, past participle of imprimere "press into or upon, stamp," also figurative, from assimilated form of in- "into, in, on, upon" (from PIE root *en "in") + premere "to press, hold fast, cover, crowd, compress" (from PIE root *per- (4) "to strike"). Literal sense of "to apply with pressure, make a permanent image in, indent, imprint" is from early 15c. in English. Related: Impressed; impressing.

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impress (n.)
"act of impressing" (1590s), also "characteristic mark" (1580s), from impress (v.1). From 1620s as "badge worn by nobility or their retainers," from Italian impresa; earlier in English in this sense as impreso, imprese (1580s).
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impress (v.2)
"levy for military service," 1590s, from assimilated form of in- (2) "into, in" + press (v.2). Related: Impressed; impressing.
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impressment (n.)
1796, "act of impressing into public service or use," from impress (v.2) + -ment.
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impressable (adj.)

"liable to be impressed into public service," 1865, from impress (v.2) + -able. Earlier it was used in the sense "capable of receiving impression" and "impressionable." Related: Impressability.

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impressed (adj.)
early 15c., "pressed or forced upon" (the mind), past-participle adjective from impress (v.).
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impressible (adj.)
"capable of receiving impression," 1620s, from impress (v.1) + -able. Related: Impressibly; impressibility.
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impressive (adj.)
1590s, "capable of being easily impressed" (a sense now rare or obsolete), from impress (v.1) + -ive. Meaning "capable of making an impression on the mind or senses, tending to excite attention and feeling" is from 1775. Related: Impressively; impressiveness.
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unimpressed (adj.)
1861, "not awed," from un- (1) "not" + past participle of impress (v.). Used earlier in a sense of "not subjected to restraint" (1743). Unimpressive is recorded from 1796.
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*per- (4)

Proto-Indo-European root meaning "to strike," an extended sense from root *per- (1) "forward, through."

It forms all or part of: compress; depress; espresso; express; impress (v.1) "have a strong effect on the mind or heart;" imprimatur; imprint; oppress; oppression; pregnant (adj.2) "convincing, weighty, pithy;" press (v.1) "push against;" pressure; print; repress; reprimand; suppress.

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