[si-nes-uh nt]


growing old; aging.
Cell Biology. (of a cell) no longer capable of dividing but still alive and metabolically active.

Origin of senescent

1650–60; < Latin senēscent- (stem of senēscēns) present participle of senēscere ‘to grow old’, equivalent to sen- ‘old’ + -ēscent- -escent
Related formsse·nes·cence, nounun·se·nes·cent, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for senescence

Contemporary Examples of senescence

  • And here Paul does appear to speak for his generation: He has given us the finest example yet of yuppie selfishness in senescence.

    The Daily Beast logo
    The Biggest Rand Paul Outrage Yet

    Kent Sepkowitz

    June 15, 2010

Historical Examples of senescence

British Dictionary definitions for senescence



growing old
characteristic of old age
Derived Formssenescence, noun

Word Origin for senescent

C17: from Latin senēscere to grow old, from senex old
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for senescence

1690s, from senescent + -ence. Related: Scenescency (1660s).



1650s, from Latin senescentem (nominative scenescens), present participle of senescere "to grow old," from senex "old" (see senile).

Online Etymology Dictionary, © 2010 Douglas Harper

senescence in Medicine




The process of growing old; aging.




Growing old; aging.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.