First order approximation

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First, First aid, First to file and first to invent, First Minister and Deputy First Minister of Northern Ireland, First Minister of Scotland, First Beeline, First London, First Boston, First West Yorkshire, First baseman, FIRST Robotics Competition, First Student, First Worcester, First ladies of Nevada, First Act, First contact, First Love, First Time, B2 First, First woman, First degree, First impression, First aid kit, First family, First ascent, First Nations, First Fruits, First Line, First man or woman, First American, First of May, First Light, First person, First Union, First Horizon Bank, First ladies of Pennsylvania, First lady, First Fleet, First Glasgow, Who's on First?, Credit Suisse First Boston, First Things First, Kʼómoks First Nation, First Things First (album), Deputy First Minister of Scotland, First responder, Singaporeans First, First-person narrative, The First Noel, First National Pictures, First Cut, FIRST Tech Challenge, First Minister of Wales, FIRST Lego League Challenge, First-class cricket, First Hampshire & Dorset, First Ministers' conference, First-order logic, Ɂakisq̓nuk First Nation, First Artists, First Step, First Lady of the United States, First Nehru ministry, First Nations in Ontario, First ladies and gentlemen of Alaska, First ladies and gentlemen of North Carolina, First Lady of Ethiopia, First South West, First Kiss, First-rate, First strike, First-person (video games), First Album, First ladies of Wisconsin, Stoney Nakoda First Nation, First and Last, First Data, First ladies and gentlemen of Guam, First grade, First Chicago Bank, First Lady of Venezuela, Be First, First Republic of Korea, First ladies and gentlemen of Oklahoma, First Nations in Canada, First Scotland East, First Presidency (LDS Church), First minister, First Merchants Corporation, First Growth, First American Financial Corporation, Breadth-first search, First-foot, First Lord of the Admiralty, First West of England, First Nations in Alberta, For the First Time, First ladies and gentlemen of the Philippines, First day of issue, First-hitting-time model, Dehcho First Nations, America First, RSS First Step, First Hill, Seattle, People-first language, First sergeant, Love at First Sight, FIRST Championship, First pass effect, First principle, First Blood, Wizard's First Rule, Ceremonial first pitch, The First 48, First Folio, FirstGroup, First hand, First ladies and gentlemen of Mexico, First Lady of the Gambia, First ladies of Maryland, First-wave feminism, List of first ladies of Minnesota, First ladies of Hawaii, First Expired, First Out, The First, First Things First (talk show), Maxillary first premolar, First World problem, First Lady of Brazil, Certified first responder, First lieutenant, Mitaanjigamiing First Nation, First ladies and gentlemen of Gabon, First Church, First Evil, First class, First Internet Bank, First ladies of Missouri, First ladies and gentlemen of Slovakia, First Second Books, First Twenty Years, First-mover advantage, First Eagle Investments, First ladies and gentlemen of Indonesia, Sipekne'katik First Nation, First party, First ladies of North Dakota, Beneteau First 14, Sq'éwlets First Nation, First Choice (UK), Sofia the First