Pronunciation guide: IPA symbols, stress and word endings

θ	thin	ð	this	ʃ	she	ʒ	measure
tʃ	church	dʒ	judge	ŋ	sing	j	yes

p b t d k g f v s z h m n l r w sound as in ordinary English spelling.

ˈ main stress, before the stressed syllable: /ˈwɔːtə/ water · ˌ lighter (secondary) stress: /ˌʌndəˈstænd/ understand
ː a long vowel · (r) an r said only in accents that pronounce it (most American, Scottish, Irish)

-s / -es (plurals; he/she form of verbs): /s/ after voiceless sounds (cats), /z/ after voiced (dogs), /ɪz/ after s, z, sh, ch, j sounds (buses, watches). Spelling: -es after s, x, z, ch, sh; consonant + y → -ies (city → cities).
-ed (past): /t/ after voiceless sounds (walked), /d/ after voiced (played), /ɪd/ after t or d (wanted). Spelling: love → loved, stop → stopped, carry → carried.
-ing: make → making, run → running, see → seeing.
Irregular: go, went, gone · be, was, been · see, saw, seen · man → men · child → children · mouse → mice.
Older (King James) forms: -eth = -s (he loveth = he loves) · -est with “thou” (thou lovest) · spake = spoke.

online

/ˈɒnlaɪn/ adjective, adverb, verb

Forms onlines onlining onlined on-line

adjective Of a generator or power plant: connected to the grid.
adjective Of a computer: actively connected to the Internet or to some other communications service. “Is this modem online?”
adjective Available over, or delivered from, the Internet. “I prefer to read online newspapers.”
adjective Connected to the Internet. “I'll be online tonight, so I'll be able to reply to your email.”
adjective Available on a computer system, even if not networked. “Press the F1 key to access the online help.”
adjective Of a system: active, particularly building facilities (such as power) or a factory or power plant. “The power is online.”
adjective (slang) Immersed in Internet culture. (Usually modified by an intensifier such as extremely or terminally) “terminally online”
adjective (computing theory, of an algorithm) Able to process an input piece-by-piece without needing to have the entire input available to it from the start.
adverb While online; while in a running or active state, or connected to the Internet. “He works online.”
verb (computing, transitive) To bring (a system, etc.) online; to promote to an active or running state.

Synonyms

1950, from on + line.

Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “online”, CC BY-SA 4.0. Details