epoch

C2 · Proficiency Countable noun Science Technical

n. a unit of time used by scientists to describe millions of years in Earth's history.

n. a geochronologic unit of time, typically lasting millions of years, representing a subdivision of a period.

“We are currently living in the Holocene epoch, which began after the last ice age.”

“The transition between the Eocene and Oligocene epochs is marked by significant global cooling and changes in marine life.”

C2 · Proficiency Countable noun Computing Technical

n. the exact date and time that a computer system uses to start counting time.

n. a fixed point in time used as a reference from which time is measured in a computing system.

Español:época

“The Unix epoch began at midnight on January 1, 1970.”

“The system clock calculates the current time by counting the number of seconds elapsed since the designated epoch.”

C2 · Proficiency Countable noun Computing Technical

n. one full cycle of training an AI using all the available data.

n. one complete pass of the entire training dataset through a machine learning algorithm.

“The model's accuracy improved significantly after the tenth epoch of training.”

“Training was halted after fifty epochs to prevent the neural network from overfitting the training data.”

C2 · Proficiency Science Technical

v. to divide a long recording of data into smaller pieces based on time.

v. to segment continuous data, such as an EEG recording, into specific time-locked windows for analysis.

“The researcher had to epoch the brainwave data to analyze the response to each sound.”

“The raw signal was epoched into two-second intervals relative to the onset of the visual stimulus.”