/ˌɒpəˈtjuːnɪzəm/
[noun] The practice of taking advantage of situations or opportunities to gain benefits, often without worrying about whether it is fair or honest. It usually suggests that someone puts personal gain above principles or loyalty.
Opportunism was born from the Latin word for a favourable wind blowing a ship safely into harbour.
The story of opportunism begins on the water. The Latin word 'opportunus' was originally a nautical term, built from 'ob' (meaning 'toward') and 'portus' (meaning 'harbour' or 'port'). Together they described the wind or conditions that were blowing favourably — driving a ship toward the safety of port. From this vivid image of good timing and helpful circumstance, 'opportunus' shifted in meaning to describe anything that was fitting, convenient, or well-timed. The same root 'portus' also gave English the words 'port', 'portal', and 'transport', all carrying that original sense of passage and arrival.
From 'opportunus', Latin formed the noun 'opportunitas', meaning a favourable moment or the right set of conditions for action. This passed into Old French as 'opportunité', and from there into English as 'opportunity' by the late 15th century. For a long time, English had 'opportunity' but no single word to describe the habit of ruthlessly chasing such moments. That gap would eventually be filled — but not until the political upheavals of the 19th century made it necessary.
The word 'opportunism' itself was coined in the context of French politics during the 1870s and 1880s. After the fall of Napoleon III and the establishment of the Third Republic, a group of moderate republicans led by Léon Gambetta adopted a flexible, pragmatic approach to governing — advancing republican ideals step by step rather than all at once. Their critics, who wanted bolder and faster reform, began to call them 'opportunistes', meaning politicians who acted only when the moment happened to suit them. The term was at first an insult, implying a lack of real conviction, but Gambetta's followers eventually wore it as a badge of honour.
English borrowed 'opportunism' directly from the French 'opportunisme' around the 1870s and 1880s, initially used to describe exactly this French political phenomenon. It passed from there into 'opportunist' (a person who practises opportunism) and the adjective 'opportunistic'. The meaning quickly expanded beyond politics. By the early 20th century, writers and thinkers were using the word in philosophy, business, sport, biology, and everyday life to describe any behaviour that prioritises seizing an advantage over following a consistent plan or code of ethics.
What makes the word's journey so striking is how far it has drifted from those sunny harbour winds. 'Opportunus' described a blessing — the right wind at the right moment, something sailors prayed for. Today, 'opportunism' almost always carries a critical edge. To call someone an opportunist is rarely a compliment; it suggests they are calculating, self-serving, or willing to bend their values when it suits them. Yet the original Latin root reminds us that sensing the right moment and acting on it was once considered simple wisdom. The word sits at the fascinating crossroads between resourcefulness and selfishness, and different speakers land on different sides depending on how much they admire the person being described.
The biological sense of the word, which developed through the 20th century, is perhaps the most neutral surviving use. An 'opportunistic infection', for example, is one caused by a microorganism that takes advantage of a weakened immune system — the germ is simply doing what conditions allow. In ecology, an 'opportunistic species' is one that rapidly exploits new resources when they become available. In these scientific contexts, the moral judgement drains away and we are left with something very close to the original Latin: a creature that knows how to read the wind and sail for harbour.