1. vital

adjective. (ˈvaɪtəl) Urgently needed; absolutely necessary.
Synonyms
indispensable critical
Antonyms
dispensable unaware nonexistent

2. sign

noun. (ˈsaɪn) A perceptible indication of something not immediately apparent (as a visible clue that something has happened).
Synonyms
clew token clue cue mark
Antonyms
stand still go off disadvantage refrain leave office
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

3. sign

verb. (ˈsaɪn) Mark with one's signature; write one's name (on).
Synonyms
write rubricate subscribe
Antonyms
attach unify wholly employer
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

4. sign

verb. (ˈsaɪn) Approve and express assent, responsibility, or obligation.
Synonyms
formalise endorse indorse ratify formalize validate
Antonyms
invalidate disorganize disorganise call option undeceive
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

5. sign

verb. (ˈsaɪn) Be engaged by a written agreement.
Synonyms
execute ink endorse undersign contract indorse inscribe countersign undertake autograph initial
Antonyms
disassembly misconstruction inside outside misconception
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

6. sign

noun. (ˈsaɪn) A public display of a message.
Synonyms
card poster posting notice guidepost signpost communication street sign bill placard
Antonyms
stay in place advance fearlessness alarming unalarming
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

7. sign

noun. (ˈsaɪn) Any nonverbal action or gesture that encodes a message.
Synonyms
radiotelegraphic signal symbol alarum high sign dog-ear indicator output signal starting signal input whistling output start warning signal telegraphic signal signal bugle call curfew animal communication time signal signaling number whistle distress call radio beacon recording phone number ticktack storm signal distress signal retreat visual signal alarm telephone number radio beam communication electronic signal input signal drumbeat alert beam all clear
Antonyms
unimpressive majority minority Roman numeral Arabic numeral
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

8. sign

noun. (ˈsaɪn) Structure displaying a board on which advertisements can be posted.
Synonyms
hoarding sandwich board billboard scoreboard signboard shingle construction structure
Antonyms
death middle arrive stop close
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

9. sign

verb. (ˈsaɪn) Engage by written agreement.
Synonyms
hire sign up contract contract out engage employ sign on
Antonyms
fire negate deglycerolize disarrange divest
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)

10. sign

noun. (ˈsaɪn) (astrology) one of 12 equal areas into which the zodiac is divided.
Synonyms
house star sign mansion region part planetary house sign of the zodiac zodiac
Antonyms
decode avoid refuse last gladden
Etymology
sign (English)
signe (Old French (842-ca. 1400))
signer (Old French (842-ca. 1400))
signare (Latin)
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