Merriam-Webster's Dictionary and Thesaurus - Merriam-Webster [1226]
se·cede verb se·ced·ed; se·ced·ing : to withdraw from an organized body and esp. from a political body
se·ces·sion noun : the act of seceding
— se·ces·sion·ist noun
se·clude verb se·clud·ed; se·clud·ing : to keep or shut away from others
Synonyms
cut off, insulate, isolate, segregate, separate, sequester—more at ISOLATE
secluded adjective 1 : screened or hidden from view
2 : living in seclusion
Synonyms
cloistered, covert, isolated, quiet, remote, secret; also lonely, solitary; private
se·clu·sion noun : the act of secluding : the state of being secluded
— se·clu·sive adjective
Synonyms
insulation, isolation, segregation, sequestration, solitude—more at ISOLATION
1second adjective [ORIGIN: ME, fr. AF secund,fr. L secundus second, following, favorable, fr. sequi to follow]
1 : being number two in a countable series
2 : next after the first
3 : ALTERNATE — second or sec·ond·ly adverb 2second noun 1 : one that is second 2 : one who assists another (as in a duel) 3 : an inferior or flawed article (as of merchandise) 4 : the second forward gear in a motor vehicle 3second noun [ORIGIN: ME secunde, fr. ML secunda, fr. L, fem. of secundus second; fr. its being the second division of a unit into 60 parts, as a minute is the first] 1 : the 60th part of a minute of time or angular measure 2 : an instant of time Synonyms flash, instant, jiffy, minute, moment, shake, trice, twinkle, twinkling, wink—more at INSTANT 4second verb 1 : to encourage or give support to 2 : to act as a second to 3 : to support (a motion) by adding one's voice to that of a proposer 1secondary adjective 1 : second in rank, value, or occurrence 2 : belonging to a second or later stage of development 3 : coming after the primary or elementary <~ schools> Synonyms inferior, mean, minor, second-rate—more at INFERIOR 2secondary noun, plural -ar·ies : the defensive backfield of a football team secondary sex characteristic noun : a physical characteristic that appears in members of one sex at puberty or in seasonal breeders at breeding season and is not directly concerned with reproduction second fiddle noun : one that plays a supporting or subservient role sec·ond–guess verb 1 : to think out other strategies or explanations for after the event 2 : to seek to anticipate or predict sec·ond·hand adjective 1 : not original 2 : not new : USED <~ clothes> 3 : dealing in used goods secondhand smoke noun : tobacco smoke that is exhaled by smokers or is given off by burning tobacco and is inhaled by persons nearby second lieutenant noun : a commissioned officer (as in the army) ranking next below a first lieutenant sec·ond–rate adjective : of second or inferior quality or value Synonyms common, fair, indifferent, mediocre, medium, middling, ordinary, passable, run-of-the-mill, so-so—more at MEDIOCRE cheap, cut-rate, inferior, junky, lousy, mediocre, poor, sleazy sec·ond–string adjective : being a substitute (as on a team) se·cre·cy noun, plural -cies 1 : the habit or practice of being secretive 2 : the condition of being hidden or concealed 1secret adjective 1 : kept from knowledge or view 2 : working with hidden aims or methods : COVERT, STEALTHY; also : engaged in detecting or spying 3 : kept from general knowledge — se·cret·ly adverb Synonyms [2] clandestine, covert, furtive, hugger-mugger, private, sneak, sneaky, stealthy, surreptitious, undercover, underground, underhanded; also classified, confidential, restricted, top secret, undisclosed; concealed, hidden, secreted, subterranean, unadvertised, unexposed Antonyms open, overt, public [3] confidential, hushed, inside, intimate, private—more at PRIVATE 2secret noun 1 : something kept hidden or unexplained : MYSTERY 2 : something kept from the knowledge of others Synonyms conundrum, enigma, mystery, mystification, puzzle, puzzlement, riddle—more at MYSTERY sec·re·tar·i·at noun 1 : the office