Origins
Few words in any language carry as much emotional weight as 'love,' and few have etymological roots as ancient and stable. The English word descends from Old English 'lufu,' itself from Proto-Germanic *lubō, which traces to the Proto-Indo-European root *lewbʰ-, meaning 'to care for' or 'to desire.' This root has been reconstructed with high confidence based on cognates across multiple branches of the Indo-European family.
In the Germanic languages, the root produced a rich family of forms. Old English had not only the noun 'lufu' but the adjective 'lēof' (dear, beloved — surviving in the archaic 'lief'), the verb 'lufian' (to love), and the compound 'lufu-tācen' (love-token). German 'Liebe,' Dutch 'liefde,' and the extinct Gothic 'liufs' (dear, beloved) all descend from the same Proto-Germanic ancestor.
Outside Germanic, the PIE root *lewbʰ- took different semantic paths. In Latin, it produced 'lubēre' (later 'libēre'), meaning 'to be pleasing' — the source of 'libido' (desire), 'liberal' (befitting a free person, originally one who acts from desire rather than compulsion), and 'libertine.' In Sanskrit, 'lubhyati' means 'to desire strongly' or 'to be confused by desire.' The Slavic branch preserved the root in Old Church Slavonic 'ljubŭ' (dear) and 'ljubiti' (to love), ancestors of Russian 'любовь' (lyubov', love) and 'любить' (lyubit', to love).
Proto-Indo-European Roots
The semantic range of 'love' in English is extraordinarily broad compared to many other languages. Ancient Greek famously distinguished 'eros' (passionate love), 'philia' (friendship-love), 'storge' (familial love), and 'agape' (unconditional love). English uses 'love' for all of these, plus affection for objects ('I love this book'), activities ('I love swimming'), and foods ('I love chocolate'). This semantic generality is not a deficiency but a feature of Germanic's inheritance: the PIE root *lewbʰ- was itself broad, encompassing care, desire, and pleasure without sharp categorical distinctions.
The word's phonological history is straightforward. Old English 'lufu' had a short 'u' vowel, which remained through Middle English (spelled 'luve' or 'love'). The Great Vowel Shift of the fifteenth to seventeenth centuries did not affect short 'u' in the same way it transformed long vowels, so 'love' retained its /ʌ/ pronunciation. The spelling with 'o' rather than 'u' dates from the Middle English scribal practice of using 'o' before 'n,' 'm,' 'v,' and 'w' to improve legibility, since the minims (vertical strokes) of 'u,' 'v,' 'n,' and 'm' were difficult to distinguish in medieval handwriting.
One of the word's most curious cultural appearances is in tennis, where 'love' means a score of zero. The most popular explanation traces this to French 'l'œuf' (the egg), referring to the oval shape of zero. However, many etymologists prefer the theory that it derives from the phrase 'to play for love' — that is, to play for nothing, for the pure pleasure of the game. The Oxford English Dictionary cautiously favors the latter explanation, though certainty remains elusive.
Old English Period
What is certain is that 'love' has been central to English literature from its earliest recorded moments. The Old English poem 'The Wife's Lament' uses 'lufu' to describe an ache of longing; Chaucer's Canterbury Tales deployed 'love' in every register from sacred devotion to bawdy comedy; and Shakespeare used the word over two thousand times across his works. The word's stubborn simplicity — one syllable, four letters, unchanged in basic meaning for over a thousand years — is itself a kind of reflects the thing it names.