Watch Glossary

Secondary dial displaying 24-hour time format instead of traditional 12-hour cycle.

Display indicating days elapsed in current lunar cycle from new moon to full moon.

Watch combining chronograph stopwatch function with mechanical alarm capability.

Mechanical mechanism that sounds an alert at a preset time, requiring a separate alarm barrel and trigger.

Mechanical striking system activating audible alert at predetermined time.

Photoreceptor that auto-adjusts display brightness based on surrounding conditions

Thermistor measuring environmental temperature for weather prediction applications

Traditional escapement design shaped like an anchor, most common in mechanical watches before lever escapements.

Calendar mechanism requiring manual correction only once per year in February or March.

Calendar watch combining annual and perpetual calendar features for extended accuracy.

Complication requiring manual winding of the mainspring only once per year, storing energy for 365 days.

Historic astronomical instrument adapted into watch form to measure celestial positions and angles.

Mechanical display showing atmospheric pressure changes, indicating weather patterns or altitude.

Pressure sensor calculating elevation gain for mountaineering and aviation watches

Oversized date numerals displayed in one or two windows on the dial for better readability.

Fingerprint or heart rate sensor for secure smartwatch access control

Optical pulse oximetry module measuring arterial oxygen levels continuously

Chronograph pushers integrated into the watch bracelet lugs rather than case sides.

Dial representation showing positions of stars, constellations, and celestial bodies.

Complication allowing precise measurement of elapsed time with start, stop, and reset functions via pushers.

Chronograph feature allowing single-button reset while running, then immediate restart.

Multiple chronograph hands pivoting from center of dial for simultaneous event timing.

Chronograph operated by a single button controlling start, stop, and reset functions sequentially.

Traditional chronograph with individual pushers for start, stop, and reset for maximum control.

Chronograph with separate pushers for start/stop and reset functions for easier operation.

High-precision movement meeting COSC standards with chronometer certification, achieving ±-4/+6 seconds accuracy.

Interaction between multiple complications affecting overall function

Multiple complex functions combined in single timepiece

Mechanism extending power storage across multiple barrels

Chronograph integrated with main timekeeping mechanism sharing components

Moment when chronograph hand reaches maximum measurement capacity

Quick-set mechanism advancing calendar without advancing hour hand

Simple complication displaying the current date, typically requiring manual adjustment for months with fewer days.

Dual window showing both day of week and date of month simultaneously on the dial.

Subdial showing whether current time is daytime or nighttime

Jumping seconds hand that advances in discrete steps rather than continuously, European term.

Seconds hand that advances in discrete ticks rather than smoothly, pausing between each second.

Chronograph with dial divisions marked in tenths of a second rather than traditional fifths.

Shows time in decimal system dividing the day into 10 hours, used in scientific or historical contexts.

Mechanism mechanically adding or subtracting time from two different sources to derive a third function.

Mechanical display of time using numerals in windows rather than traditional hands.

Two superimposed chronograph hands allowing simultaneous timing of multiple independent events.

Two independent tourbillons rotating in opposite directions for improved chronometric performance.

Displays two different time zones simultaneously, typically with a 24-hour hand tracking second zone.

Integrated cardiac rhythm sensor for health monitoring in advanced smartwatches

Moving hour hand that varies in speed to track the equation of time throughout the year.

Shows the difference between mean solar time and apparent solar time, ranging from -14 to +16 minutes.

Chronograph that instantly resets and restarts with a single pusher action, without stopping first.

Chronograph reset mechanism allowing restart without returning to zero, jumping to new time.

Tourbillon cage mounted on single end, appearing to float without visible lower bridge.

Lightning-fast subdial hand completing a full rotation in fractions of a second for precise timing.

Complication displaying two time zones simultaneously, typically with a 24-hour hand for second time zone.

Second time zone display allowing simultaneous viewing of time in two different locations.

Additional timezone display showing simultaneous time in different locations worldwide.

Most complex striking complication that chimes hours and quarter-hours automatically throughout the day.

Oscillating weight system maintaining constant moment of inertia regardless of position.

Miniature vibration motor providing tactile notifications without audible alerts

Seconds mechanism independent from main movement allowing separate regulation and reset function.

Integrated multi-axis gyroscope and accelerometer for motion tracking applications

Hour numeral or hand advancing discretely at hour transitions rather than continuously.