past
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prehistory/ˌpriːˈhɪstəri/ /ˌpriːˈhɪstri/
Any past time (even recent) treated as such a distant, unknowable era.
mementoes/məˈmɛntoʊz/ /məˈmɛntəʊz/
A keepsake; an object kept as a reminder of a place or event.
butterfly effect/ˈbʌtərflaɪ ɪˈfɛkt/
(by extension) The notion that small changes in the past via time travel can cause disproportionately large and unforeseeable consequences in the present.
bathing machines/ˈbeɪðɪŋ məˈʃiːnz/
Around the 19th century, a portable changing room that was rolled down a beach to the edge of the sea to allow people to paddle in the sea modestly.
go back/ɡoʊ bæk/ /ɡəʊ bæk/
To extend into past time.
cavemen/ˈkeɪvmɛn/
An early human or closely related species, popularly held to reside in caves.
past tense/ˈpæst tɛns/ /ˈpɑːst tɛns/
(grammar) A grammatical form (often a verb form) that is used in a conditional expression to refer to an event, transaction, occurrence, or object that is hypothetical and often counterfactual.
twin/twɪn/
(obsolete outside Scotland) To split, part; to go away, depart.
palaeoecology/ˌpælioʊɪˈkɒlədʒi/ /ˌpeɪlioʊɪˈkɒlədʒi/
The study of past ecologies by using the evidence of fossils
cobwebs/ˈkɒbˌwɛbz/ /ˈkɑːbˌwɛbz/
(usually in the plural) fuzzy inexact memories